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Revenue recognition and operating segments - One-off and adjusting items - operating (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Analysis of one-off operating items |  |  |
One-off and adjusting items | £ 136 | £ 21 | £ 8
One-off and adjusting items tax impact | (20) | (2) | (2)
One-off and adjusting items cash inflow/(outflow) | (59) | (27) | (2)
Acquisition and integration costs |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items | 5 | 13 | 15
One-off and adjusting items tax impact | (2) | (1) | (3)
One-off and adjusting items cash inflow/(outflow) | (13) | (12) | (15)
Fees relating to Terminix transaction |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items | 68 |  |
One-off and adjusting items tax impact | (4) |  |
One-off and adjusting items cash inflow/(outflow) | (38) |  |
Pension scheme closure in North America |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items |  |  | (7)
One-off and adjusting items tax impact |  |  | 2
Terminix acquisition costs |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items |  | 6 |
One-off and adjusting items cash inflow/(outflow) |  | (6) |
Terminix integration costs |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items | 62 |  |
One-off and adjusting items tax impact | (14) |  |
One-off and adjusting items cash inflow/(outflow) | (32) |  |
UK Pension scheme - return of surplus |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items cash inflow/(outflow) | 22 |  | 9
Other |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items | 1 | 2 |
One-off and adjusting items tax impact |  | (1) | (1)
One-off and adjusting items cash inflow/(outflow) | £ 2 | £ (9) | £ 4

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