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Operating expenses by nature - 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
Acquisition and integration costs |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items | 5 | 13 | 15
Pension scheme closure in North America |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items |  |  | £ (7)
Terminix acquisition costs |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items | 68 | 6 |
Terminix integration costs |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items | 62 |  |
Other |  |  |
Analysis of one-off operating items |  |  |
One-off and adjusting items | £ 1 | £ 2 |

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