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Leases - Right of use assets (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Leases |  |
Net book value at beginning of the year | £ 228 | £ 218
Exchange differences | 3 | (3)
Additions | 138 | 91
Disposals |  | (2)
Acquisition of companies and businesses | 199 | 8
Impairment charge | (17) |
Depreciation charge | (89) | (78)
Reclassification to property, plant and equipment | (8) | (6)
Net book value at end of the year | 454 | 228
Acquisitions | 200 | 2
Impaired right-of-use assets |  |
Leases |  |
Recoverable amount | £ 25 |
Discount rate | 6.00% |
Land and buildings |  |
Leases |  |
Net book value at beginning of the year | £ 94 | 96
Exchange differences |  | (2)
Additions | 69 | 33
Disposals |  | (1)
Acquisition of companies and businesses | 79 | 5
Impairment charge | (17) |
Depreciation charge | (43) | (37)
Net book value at end of the year | 182 | 94
Vehicles |  |
Leases |  |
Net book value at beginning of the year | 132 | 120
Exchange differences | 3 | (1)
Additions | 69 | 56
Disposals |  | (1)
Acquisition of companies and businesses | 120 | 3
Depreciation charge | (45) | (39)
Reclassification to property, plant and equipment | (8) | (6)
Net book value at end of the year | 271 | 132
Other equipment |  |
Leases |  |
Net book value at beginning of the year | 2 | 2
Additions |  | 2
Depreciation charge | (1) | (2)
Net book value at end of the year | £ 1 | £ 2

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The discount rate used in the current estimate of the present value of the future cash flows expected to be derived from an asset or cash-generating unit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 130 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_130_g&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The higher of an asset’s (or cash-generating unit’s) fair value less costs of disposal and its value in use. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 130 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_130_e&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_j&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_a&doctype=Standard -URIDate 2023-03-23 + Details
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