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Property, plant and equipment - Additional Information (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment |  |
Impairments on fixed assets | £ 8 | £ 0
Freehold buildings | Minimum |  |
Disclosure of detailed information about property, plant and equipment |  |
Property, plant and equipment, estimated useful life | 50 years |
Freehold buildings | Maximum |  |
Disclosure of detailed information about property, plant and equipment |  |
Property, plant and equipment, estimated useful life | 100 years |
Vehicles | Minimum |  |
Disclosure of detailed information about property, plant and equipment |  |
Property, plant and equipment, estimated useful life | 4 years |
Vehicles | Maximum |  |
Disclosure of detailed information about property, plant and equipment |  |
Property, plant and equipment, estimated useful life | 10 years |
Plant and equipment, including service contract equipment | Minimum |  |
Disclosure of detailed information about property, plant and equipment |  |
Property, plant and equipment, estimated useful life | 3 years |
Plant and equipment, including service contract equipment | Maximum |  |
Disclosure of detailed information about property, plant and equipment |  |
Property, plant and equipment, estimated useful life | 10 years |
Office equipment, furniture and fittings | Minimum |  |
Disclosure of detailed information about property, plant and equipment |  |
Property, plant and equipment, estimated useful life | 3 years |
Office equipment, furniture and fittings | Maximum |  |
Disclosure of detailed information about property, plant and equipment |  |
Property, plant and equipment, estimated useful life | 10 years |

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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2022-03-24 -Paragraph 73 -Subparagraph e -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 98 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_98_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2022-03-24 -Paragraph 73 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_c&doctype=Standard -URIDate 2022-03-24 + Details
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