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Trade and other receivables - Analysis of the provision for impairment of trade receivables (Details) - Trade receivables - Accumulated impairment - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Trade and other receivables |  |  |
Beginning balance | £ 70 | £ 70 | £ 50
Exchange differences | (1) | (4) |
Additional provision | 62 | 48 | 30
Receivables written off as uncollectable | (63) | (38) | (27)
Unused amounts reversed | (6) | (8) | (5)
Acquisition of companies and businesses | 3 | 2 | 22
Ending balance | £ 65 | £ 70 | £ 70

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