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Revenue recognition and operating segments (Details) £ in Millions | 12 Months Ended
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Dec. 31, 2022 GBP (£) item | Dec. 31, 2021 GBP (£) item | Dec. 31, 2020 GBP (£)
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Revenue | £ 3,714 | £ 2,957 | £ 2,803
Contract costs | 182 | 75 | 68
Amortisation of contract costs | 39 | 30 | 28
Impairment losses on contract costs | £ 0 | £ 0 | 0
Number of secondary reportable business segments | item | 3 | 3 |
UK & Ireland |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Revenue |  |  | 288
Minimum |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Amortization period of contract costs | 3 years |  |
Minimum | UK & Ireland |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Estimation uncertainty affecting revenue |  |  | (1)
Maximum |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Amortization period of contract costs | 7 years |  |
Maximum | UK & Ireland |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Estimation uncertainty affecting revenue |  |  | £ 5
Termite contracts |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Period of assurance warranties | 12 months |  |
Protect & Enhance |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Number of businesses | item |  | 5 |
Job work | Maximum |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Period of service | 1 month |  |
Job work | Hygiene & Wellbeing | Performance obligations satisfied at point in time | Maximum |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Period of service | 7 days |  |

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- Definition The amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 128 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_128_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard -URIDate 2023-03-23 + Details
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