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Related undertakings - Summary of full list of related parties - Australia to Italy (Details)	12 Months Ended
	Dec. 31, 2023
Australia \| Agricultural Insights Pty Ltd \| Ordinary
Related party transactions
Company name	Agricultural Insights Pty Ltd
Percentage of undertaking	100.00%
Reg office	AUS1
Australia \| LNRS Data Services (Australia) Pty Ltd \| Ordinary
Related party transactions
Company name	LNRS Data Services (Australia) Pty Ltd
Percentage of undertaking	100.00%
Reg office	AUS1
Australia \| Reed Exhibitions Australia Pty Ltd \| Ordinary
Related party transactions
Company name	Reed Exhibitions Australia Pty Limited
Percentage of undertaking	100.00%
Reg office	AUS2
Australia \| RELX Holdings Australia Pty Ltd \| Ordinary
Related party transactions
Company name	RELX Holdings Australia Pty Ltd
Percentage of undertaking	100.00%
Reg office	AUS2
Australia \| RELX Trading Australia Pty Limited \| Ordinary
Related party transactions
Company name	RELX Trading Australia Pty Limited
Percentage of undertaking	100.00%
Reg office	AUS2
Austria \| LexisNexis Verlag ARD ORAC GmbH & Co KG \| Partnership Interest
Related party transactions
Company name	LexisNexis Verlag ARD ORAC GmbH & Co KG
Percentage of undertaking	100.00%
Reg office	AUT2
Austria \| ORAC GmbH \| Ordinary
Related party transactions
Company name	ORAC GmbH
Percentage of undertaking	100.00%
Reg office	AUT2
Austria \| RELX Austria GmbH \| Ordinary
Related party transactions
Company name	RELX Austria GmbH
Percentage of undertaking	100.00%
Reg office	AUT3
Austria \| RX CEE GmbH \| Ordinary
Related party transactions
Company name	RX CEE GmbH
Percentage of undertaking	100.00%
Reg office	AUT1
Austria \| RX Salzburg GmbH \| Ordinary
Related party transactions
Company name	RX Salzburg GmbH
Percentage of undertaking	100.00%
Reg office	AUT3
Austria \| RX Wien GmbH \| Ordinary
Related party transactions
Company name	RX Wien GmbH
Percentage of undertaking	100.00%
Reg office	AUT1
Austria \| Standout GmbH \| Ordinary
Related party transactions
Company name	Standout GmbH
Percentage of undertaking	100.00%
Reg office	AUT4
Belgium \| LexisNexis BV \| Ordinary
Related party transactions
Company name	LexisNexis BV
Percentage of undertaking	100.00%
Reg office	BEL1
Brazil \| Elsevier Editora Ltda \| Quotas
Related party transactions
Company name	Elsevier Editora Limiteda
Percentage of undertaking	100.00%
Reg office	BRA1
Brazil \| Fircosoft Brasil Consultoria e Servicos de Informatica Ltda \| Quotas
Related party transactions
Company name	Fircosoft Brasil Consultoria e Servicos de Informatica Ltda
Percentage of undertaking	100.00%
Reg office	BRA2
Brazil \| Gestora de Inteligencia de Credito S.A. \| Common, Preferred
Related party transactions
Company name	Gestora de Inteligencia de Credito S.A. (20%)
Percentage of undertaking	20.00%
Reg office	BRA8
Brazil \| LexisNexis Informacoes e Sistemas Empresariais Ltda \| Quotas
Related party transactions
Company name	LexisNexis Informacoes e Sistemas Empresariais Limiteda
Percentage of undertaking	100.00%
Reg office	BRA6
Brazil \| LexisNexis Servicos de Analise de Risco Ltda \| Quotas
Related party transactions
Company name	LexisNexis Servicos de Analise de Risco Limiteda
Percentage of undertaking	100.00%
Reg office	BRA7
Brazil \| MLex Brasil Midia Mercadologica Ltda \| Quotas
Related party transactions
Company name	MLex Brasil Midia Mercadologica Limiteda
Percentage of undertaking	100.00%
Reg office	BRA4
Brazil \| Reed Exhibitions Alcntara Machado Ltda \| Quotas
Related party transactions
Company name	Reed Exhibitions Alcantara Machado Limiteda
Percentage of undertaking	100.00%
Reg office	BRA3
Brazil \| SST Software do Brasil Ltda \| Quotas
Related party transactions
Company name	SST Software do Brasil Limiteda
Percentage of undertaking	100.00%
Reg office	BRA5
Canada \| Corps Events IntCan \| Class A Voting
Related party transactions
Company name	Corps Events IntCan
Percentage of undertaking	100.00%
Reg office	CAN3
Canada \| Elsevier Canada Inc. \| Common
Related party transactions
Company name	Elsevier Canada Inc.
Percentage of undertaking	100.00%
Reg office	CAN2
Canada \| Human API Technologies Inc. \| Voting
Related party transactions
Company name	Human API Technologies Inc.
Percentage of undertaking	100.00%
Reg office	CAN4
Canada \| LexisNexis Canada Inc. \| Class B
Related party transactions
Company name	LexisNexis Canada Inc.
Percentage of undertaking	100.00%
Reg office	CAN1
Canada \| PCLaw Time Matters Canada Inc. \| Common
Related party transactions
Company name	PCLaw Time Matters Canada Inc.
Percentage of undertaking	100.00%
Reg office	CAN5
Canada \| RELX Canada Ltd \| Common
Related party transactions
Company name	RELX Canada Limited
Percentage of undertaking	100.00%
Reg office	CAN1
China \| Bakery China Exhibitions Co., Ltd \| Ordinary
Related party transactions
Company name	Bakery China Exhibitions Co., Limited (25%)
Percentage of undertaking	25.00%
Reg office	CHN1
China \| Beijing Medtime Elsevier Education Technology Co., Ltd \| Common
Related party transactions
Company name	Beijing Medtime Elsevier Education Technology Co., Limited (49%)
Percentage of undertaking	49.00%
Reg office	CHN2
China \| Beijing Reed Elsevier Science and Technology Co Ltd \| Common
Related party transactions
Company name	Beijing Reed Elsevier Science and Technology Co Ltd1
Percentage of undertaking	100.00%
Reg office	CHN20
China \| C-One Energy (Guangzhou) Co., Ltd \| Ordinary
Related party transactions
Company name	C-One Energy (Guangzhou) Co., Limited
Percentage of undertaking	100.00%
Reg office	CHN5
China \| Jingxunlingsi (Beijing) Information Technology Co Ltd \| Ordinary
Related party transactions
Company name	Jingxunlingsi (Beijing) Information Technology Co Ltd1
Percentage of undertaking	100.00%
Reg office	CHN4
China \| KeAi Communications Co., Ltd \| Ordinary
Related party transactions
Company name	KeAi Communications Co., Limited (49%)
Percentage of undertaking	49.00%
Reg office	CHN15
China \| LexisNexis Information Technology Co. Ltd \| Ordinary
Related party transactions
Company name	LexisNexis Information Technology Co. Limited
Percentage of undertaking	100.00%
Reg office	CHN4
China \| LexisNexis Risk Solutions (Shanghai) Information Technologies Co., Ltd \| Common
Related party transactions
Company name	LexisNexis Risk Solutions (Shanghai) Information Technologies Co. Limited
Percentage of undertaking	100.00%
Reg office	CHN7
China \| LNRS Data Services (Shanghai) Co Ltd \| Ordinary
Related party transactions
Company name	LNRS Data Services (Shanghai) Co Limited
Percentage of undertaking	100.00%
Reg office	CHN13
China \| Peili Computer Co Ltd \| Ordinary
Related party transactions
Company name	Peili Computer Co Ltd1
Percentage of undertaking	100.00%
Reg office	CHN13
China \| Reed Elsevier Information Technology (Beijing) Co., Ltd \| Common
Related party transactions
Company name	Reed Elsevier Information Technology (Beijing) Co., Limited
Percentage of undertaking	100.00%
Reg office	CHN3
China \| Reed Exhibitions (China) Co., Ltd \| Ordinary
Related party transactions
Company name	Reed Exhibitions (China) Co., Limited
Percentage of undertaking	100.00%
Reg office	CHN4
China \| Reed Exhibitions (Shanghai) Co., Ltd \| Ordinary
Related party transactions
Company name	Reed Exhibitions (Shanghai) Co., Limited
Percentage of undertaking	100.00%
Reg office	CHN10
China \| Reed Exhibitions Hengjin Co., Ltd \| Ordinary
Related party transactions
Company name	Reed Exhibitions Hengjin Co., Limited (51%)
Percentage of undertaking	51.00%
Reg office	CHN12
China \| Reed Exhibitions Kuozhan (Shanghai) Co., Ltd \| Ordinary
Related party transactions
Company name	Reed Exhibitions Kuozhan (Shanghai) Co., Limited (60%)
Percentage of undertaking	60.00%
Reg office	CHN8
China \| Reed Huabai Exhibitions (Beijing) Co., Ltd \| Ordinary
Related party transactions
Company name	Reed Huabai Exhibitions (Beijing) Co., Limited (51%)
Percentage of undertaking	51.00%
Reg office	CHN4
China \| Reed Huabo Exhibitions (Shenzhen) Co., Ltd \| Ordinary
Related party transactions
Company name	Reed Huabo Exhibitions (Shenzhen) Co., Limited (65%)
Percentage of undertaking	65.00%
Reg office	CHN16
China \| Reed Huaqun Exhibitions Co., Ltd \| Ordinary
Related party transactions
Company name	Reed Huaqun Exhibitions Co., Limited (52%)
Percentage of undertaking	52.00%
Reg office	CHN4
China \| Reed Sinopharm Exhibitions Co., Ltd \| Ordinary
Related party transactions
Company name	Reed Sinopharm Exhibitions Co., Limited (50%)
Percentage of undertaking	50.00%
Reg office	CHN4
China \| RX (China) Investment Co., Ltd \| Ordinary
Related party transactions
Company name	RX (China) Investment Co., Limited
Percentage of undertaking	100.00%
Reg office	CHN9
China \| RX (Shenzhen) Co., Ltd \| Ordinary
Related party transactions
Company name	RX (Shenzhen) Co., Limited
Percentage of undertaking	100.00%
Reg office	CHN6
China \| RX Huabo (Shenzhen) Technology Co. Limited \| Ordinary
Related party transactions
Company name	RX Huabo (Shenzhen) Technology Co. Limited1
Percentage of undertaking	100.00%
Reg office	CHN19
China \| RX Technology (Shanghai) Co. Limited \| Ordinary
Related party transactions
Company name	RX Technology (Shanghai) Co. Limited1
Percentage of undertaking	100.00%
Reg office	CHN18
China \| Shanghai Datong Medical Information Technology Co., Ltd \| Ordinary
Related party transactions
Company name	Shanghai Datong Medical Information Technology Co., Limited
Percentage of undertaking	100.00%
Reg office	CHN17
China \| Shanghai SinoReal Exhibitions Co., Ltd \| Ordinary
Related party transactions
Company name	Shanghai SinoReal Exhibitions Co., Limited (27.5%)
Percentage of undertaking	27.50%
Reg office	CHN11
China \| Z&R Exhibitions Co., Ltd \| Ordinary
Related party transactions
Company name	Z&R Exhibitions Co., Limited (27.5%)
Percentage of undertaking	27.50%
Reg office	CHN14
Colombia \| LexisNexis Risk Solutions SAS \| Ordinary
Related party transactions
Company name	LexisNexis Risk Solutions SAS
Percentage of undertaking	100.00%
Reg office	COL1
Denmark \| Elsevier A/S \| Ordinary
Related party transactions
Company name	Elsevier A/S
Percentage of undertaking	100.00%
Reg office	DNK1
Egypt \| Elsevier Egypt LLC \| Ordinary
Related party transactions
Company name	Elsevier Egypt LLC
Percentage of undertaking	100.00%
Reg office	EGY1
France \| Case Law Analytics SAS \| Ordinary
Related party transactions
Company name	Case Law Analytics SAS
Percentage of undertaking	100.00%
Reg office	FRA9
France \| Closd SAS \| Ordinary
Related party transactions
Company name	Closd SAS
Percentage of undertaking	100.00%
Reg office	FRA8
France \| Corp Events SARL \| Ordinary
Related party transactions
Company name	Corp Events SARL
Percentage of undertaking	100.00%
Reg office	FRA3
France \| Elsevier Holding France SAS \| Ordinary
Related party transactions
Company name	Elsevier Holding France SAS
Percentage of undertaking	100.00%
Reg office	FRA1
France \| Elsevier Masson SAS \| Ordinary
Related party transactions
Company name	Elsevier Masson SAS
Percentage of undertaking	100.00%
Reg office	FRA1
France \| Fircosoft SAS \| Ordinary
Related party transactions
Company name	Fircosoft SAS
Percentage of undertaking	100.00%
Reg office	FRA7
France \| GIE EDI Data \| Ordinary
Related party transactions
Company name	GIE EDI Data (83%)
Percentage of undertaking	83.00%
Reg office	FRA2
France \| GIE Juris Data \| Ordinary
Related party transactions
Company name	GIE Juris Data
Percentage of undertaking	100.00%
Reg office	FRA2
France \| Jarvis SAS \| Ordinary
Related party transactions
Company name	Jarvis SAS
Percentage of undertaking	100.00%
Reg office	FRA10
France \| LexisNexis Business Information Solutions SA \| Ordinary
Related party transactions
Company name	LexisNexis Business Information Solutions SA
Percentage of undertaking	100.00%
Reg office	FRA2
France \| LexisNexis Business Information Solutions Holding SA \| Ordinary
Related party transactions
Company name	LexisNexis Business Information Solutions Holding SA
Percentage of undertaking	100.00%
Reg office	FRA4
France \| LexisNexis International Development & Services SAS \| Ordinary
Related party transactions
Company name	LexisNexis International Development & Services SAS
Percentage of undertaking	100.00%
Reg office	FRA2
France \| LexisNexis SA \| Ordinary
Related party transactions
Company name	LexisNexis SA
Percentage of undertaking	100.00%
Reg office	FRA2
France \| Reed Exhibitions ISG SARL \| Ordinary
Related party transactions
Company name	Reed Exhibitions ISG SARL
Percentage of undertaking	100.00%
Reg office	FRA5
France \| RELX France SA \| Ordinary
Related party transactions
Company name	RELX France SA
Percentage of undertaking	100.00%
Reg office	FRA3
France \| RELX France Services SAS \| Ordinary
Related party transactions
Company name	RELX France Services SAS
Percentage of undertaking	100.00%
Reg office	FRA7
France \| RX France SAS \| Ordinary
Related party transactions
Company name	RX France SAS
Percentage of undertaking	100.00%
Reg office	FRA3
France \| SAFI SA \| Ordinary
Related party transactions
Company name	SAFI SA (50%)
Percentage of undertaking	50.00%
Reg office	FRA6
Germany \| Elsevier GmbH \| Ordinary
Related party transactions
Company name	Elsevier GmbH
Percentage of undertaking	100.00%
Reg office	DEU3
Germany \| Elsevier Information Systems GmbH \| Ordinary
Related party transactions
Company name	Elsevier Information Systems GmbH
Percentage of undertaking	100.00%
Reg office	DEU2
Germany \| IPlytics GmbH \| Ordinary
Related party transactions
Company name	IPlytics GmbH
Percentage of undertaking	100.00%
Reg office	DEU7
Germany \| LexisNexis GmbH \| Ordinary
Related party transactions
Company name	LexisNexis GmbH
Percentage of undertaking	100.00%
Reg office	DEU4
Germany \| PatentSight GmbH \| Ordinary
Related party transactions
Company name	PatentSight GmbH
Percentage of undertaking	100.00%
Reg office	DEU6
Germany \| RELX Deutschland GmbH \| Ordinary
Related party transactions
Company name	RELX Deutschland GmbH
Percentage of undertaking	100.00%
Reg office	DEU1
Germany \| RX Deutschland GmbH \| Ordinary
Related party transactions
Company name	RX Deutschland GmbH
Percentage of undertaking	100.00%
Reg office	DEU1
Germany \| Tschach Solutions GmbH \| Ordinary
Related party transactions
Company name	Tschach Solutions GmbH
Percentage of undertaking	100.00%
Reg office	DEU5
Hong Kong \| Ascend China Holding Ltd \| Ordinary
Related party transactions
Company name	Ascend China Holding Limited
Percentage of undertaking	100.00%
Reg office	HNK4
Hong Kong \| JC Exhibition and Promotion Ltd \| Ordinary
Related party transactions
Company name	JC Exhibition and Promotion Limited (65%)
Percentage of undertaking	65.00%
Reg office	HNK4
Hong Kong \| JYLN Sager Ltd \| Ordinary
Related party transactions
Company name	JYLN Sager Limited
Percentage of undertaking	100.00%
Reg office	HNK2
Hong Kong \| LNRS Data Services (China) Ltd \| Ordinary
Related party transactions
Company name	LNRS Data Services (China) Limited
Percentage of undertaking	100.00%
Reg office	HNK1
Hong Kong \| Reed Exhibitions Ltd \| Ordinary
Related party transactions
Company name	Reed Exhibitions Limited
Percentage of undertaking	100.00%
Reg office	HNK4
Hong Kong \| RELX (Greater China) Ltd \| Ordinary
Related party transactions
Company name	RELX (Greater China) Limited
Percentage of undertaking	100.00%
Reg office	HNK3
India \| FircoSoft India Private Ltd \| Ordinary
Related party transactions
Company name	FircoSoft India Private Limited (Liquidation in progress)
Percentage of undertaking	100.00%
Reg office	IND2
India \| Reed Elsevier Publishing (India) Private Ltd \| Ordinary
Related party transactions
Company name	Reed Elsevier Publishing (India) Private Limited
Percentage of undertaking	100.00%
Reg office	IND1
India \| Reed Manch Exhibitions Private Ltd \| Ordinary
Related party transactions
Company name	Reed Manch Exhibitions Private Limited
Percentage of undertaking	100.00%
Reg office	IND1
India \| Reed Triune Exhibitions Private Ltd \| Ordinary
Related party transactions
Company name	Reed Triune Exhibitions Private Limited (72%)
Percentage of undertaking	72.00%
Reg office	IND3
India \| RELX India Private Ltd \| Ordinary
Related party transactions
Company name	RELX India Private Limited
Percentage of undertaking	100.00%
Reg office	IND1
Indonesia \| PT Reed Exhibitions Indonesia \| Class A Preferred / Class B Common
Related party transactions
Company name	PT Reed Exhibitions Indonesia (70%)
Percentage of undertaking	70.00%
Reg office	IDN1
Indonesia \| PT RELX Information Analytics Indonesia \| Ordinary
Related party transactions
Company name	PT RELX Information Analytics Indonesia
Percentage of undertaking	100.00%
Reg office	IDN2
Irish Republic \| Elsevier (Ireland) Limited \| Ordinary
Related party transactions
Company name	Elsevier (Ireland) Limited
Percentage of undertaking	100.00%
Reg office	IRL2
Irish Republic \| LexisNexis Risk Solutions (Europe) Ltd \| Ordinary
Related party transactions
Company name	LexisNexis Risk Solutions (Europe) Limited
Percentage of undertaking	100.00%
Reg office	IRL1
Irish Republic \| RELX International Finance Designated Activity Company \| Ordinary
Related party transactions
Company name	RELX International Finance Designated Activity Company
Percentage of undertaking	100.00%
Reg office	IRL1
Israel \| LexisNexis Israel Ltd \| Ordinary
Related party transactions
Company name	LexisNexis Israel Ltd
Percentage of undertaking	100.00%
Reg office	ISR1
Italy \| Elsevier SRL \| Registered capital
Related party transactions
Company name	Elsevier SRL
Percentage of undertaking	100.00%
Reg office	ITA1
Italy \| ICIS Italia SRL \| Ordinary
Related party transactions
Company name	ICIS Italia SRL
Percentage of undertaking	100.00%
Reg office	ITA2
Italy \| RX Italy SRL \| Ordinary
Related party transactions
Company name	RX Italy SRL
Percentage of undertaking	100.00%
Reg office	ITA1