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Segment information - Contributions by Geographical Area (Details) - GBP (£) £ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of geographical areas [line items] |  |  |
Revenue | £ 14,741,000 | £ 14,845,000 | £ 14,429,000
Revenue less pass-through costs |  |  |
Headline operating profit | 1,707,000 | 1,750,000 | 1,742,000
Adjusting items within IFRS operating profit | (382,000) | (1,219,000) | (384,000)
Financing items | (330,000) | (255,000) | (138,000)
Earnings/(losses) from associates | 36,000 | 70,000 | (60,000)
Profit before taxation | 1,031,000 | 346,000 | 1,160,000
Non-current assets | 11,521,000 | 12,323,000 |
North America |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 5,567,000 | 5,528,000 | 5,550,000
Revenue less pass-through costs | 4,394,000 | 4,556,000 | 4,688,000
Headline operating profit | 825,000 | 834,000 | 771,000
Non-current assets | 4,736,000 | 5,218,000 |
United Kingdom |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 2,185,000 | 2,155,000 | 2,004,000
Revenue less pass-through costs | 1,588,000 | 1,626,000 | 1,537,000
Headline operating profit | 237,000 | 215,000 | 187,000
Non-current assets | 1,666,000 | 1,670,000 |
Western Continental Europe |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 3,013,000 | 3,037,000 | 2,876,000
Revenue less pass-through costs | 2,375,000 | 2,411,000 | 2,319,000
Headline operating profit | 259,000 | 258,000 | 301,000
Non-current assets | 2,512,000 | 2,696,000 |
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 3,976,000 | 4,125,000 | 3,999,000
Revenue less pass-through costs | 3,002,000 | 3,267,000 | 3,256,000
Headline operating profit | 386,000 | 443,000 | 483,000
Non-current assets | 2,607,000 | 2,739,000 |
United States |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 5,203,000 | 5,187,000 | 5,231,000
Revenue less pass-through costs | 4,115,000 | 4,271,000 | 4,402,000
Headline operating profit | 766,000 | 785,000 | £ 726,000
Non-current assets | £ 4,427,000 | £ 5,114,000 |

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