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Employee benefit obligations - Fair Value of Assets and Assessed Present Value of Liabilities in Pension Plans (Details) - GBP (£) £ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Pension Costs [abstract]
Fair value of assets, Equities	£ 25	£ 24
Fair value of assets, Bonds	175	170
Fair value of assets, Cash	8	18
Fair value of assets, Other	43	47
Total fair value of assets	251	259
Defined benefit obligation, at present value	(365)	(381)
Surplus (deficit) in plan	(114)	(122)
Irrecoverable Surplus	0	0
Net liability	(114)	(122)
Plans in surplus	18	14
Plans in deficit	£ (132)	£ (136)
Fair value of assets allocation, Equities	10.00%	9.00%
Fair value of assets allocation, Bonds	70.00%	66.00%
Fair value of assets allocation, Cash	3.00%	7.00%
Fair value of assets allocation, Other	17.00%	18.00%
Total fair value of assets allocation	100.00%	100.00%

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- Definition

The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [domain]]

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The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

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Disclosure Of Pension Costs [abstract]

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