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Fair value estimation (Tables) | 12 Months Ended
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Dec. 31, 2022
Fair value estimation |
Summary of financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair value | ​ | Fair value | ​ | Fair value | ​ | Fair value
​ | ​ | assets | ​ | liabilities | ​ | assets | ​ | liabilities
​ | ​ | 2022 | ​ | 2022 | ​ | 2021 | ​ | 2021
​ | ​ | £m | ​ | £m | ​ | £m | ​ | £m
Interest rate swaps (level 2): |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
– non-hedge |  | — |  | — |  | — |  | (1)
– cash flow hedge |  | 36 |  | (2) |  | — |  | (25)
– net investment hedge |  | 15 |  | (120) |  | 11 |  | (8)
Foreign exchange swaps (level 2): |  | ​ |  | ​ |  | ​ | ​ | ​
– non-hedge |  | — |  | — |  | 1 |  | (1)
​ |  | 51 |  | (122) |  | 12 |  | (35)
Analysed as follows: |  | ​ | ​ | ​ |  | ​ | ​ | ​
Current portion |  | — |  | — |  | 2 |  | (1)
Non-current portion |  | 51 |  | (122) |  | 10 |  | (34)
Derivative financial instruments |  | 51 |  | (122) |  | 12 |  | (35)
Contingent consideration (including put option liability) (level 3) |  | — |  | (70) |  | — |  | (75)
Analysed as follows: |  | ​ |  | ​ | ​ | ​ | ​ | ​
Current portion |  | — |  | (32) |  | — |  | (23)
Non-current portion |  | — |  | (38) |  | — |  | (52)
Other payables |  | — |  | (70) |  | — |  | (75)
​
Summary of contingent consideration | ​
​ | ​ | ​ | ​ | ​
​ |  | Contingent |  | Contingent
​ | ​ | consideration | ​ | consideration
​ | ​ | 2022 | ​ | 2021
​ | ​ | £m | ​ | £m
At 1 January |  | 75 |  | 63
Exchange differences |  | (2) |  | (8)
Acquisitions |  | 18 |  | 24
Payments |  | (24) |  | (12)
Revaluation of put option through equity |  | 3 |  | 8
At 31 December |  | 70 |  | 75
​
Summary of maturity of financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Less than |  | Between |  | Between |  | More than |  | ​
​ | ​ | 1 year | ​ | 1 and 2 years | ​ | 2 and 5 years | ​ | 5 years | ​ | Total
​ | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m
At 31 December 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cross-currency interest rate swaps: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (64) |  | (460) |  | (909) |  | (549) |  | (1,982)
– inflow |  | 20 |  | 390 |  | 874 |  | 534 |  | 1,818
Interest rate swaps: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (1) |  | (3) |  | — |  | — |  | (4)
– inflow |  | 10 |  | 9 |  | — |  | — |  | 19
Foreign exchange swaps: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (15) |  | — |  | — |  | — |  | (15)
– inflow |  | 15 |  | — |  | — |  | — |  | 15
Foreign exchange forwards: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | — |  | — |  | — |  | — |  | —
– inflow |  | — |  | — |  | — |  | — |  | —
Net inflow/(outflow) | ​ | (35) |  | (64) |  | (35) |  | (15) |  | (149)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At 31 December 2021 |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cross-currency interest rate swaps: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (18) |  | (14) |  | (471) |  | (158) |  | (661)
– inflow |  | 12 |  | 5 |  | 445 |  | 148 |  | 610
Interest rate swaps: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (8) |  | (6) |  | (6) |  | — |  | (20)
– inflow |  | 2 |  | 3 |  | 4 |  | — |  | 9
Foreign exchange swaps: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (385) |  | — |  | — |  | — |  | (385)
– inflow |  | 387 |  | — |  | — |  | — |  | 387
Foreign exchange forwards: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (34) |  | — |  | — |  | — |  | (34)
– inflow |  | 34 |  | — |  | — |  | — |  | 34
Net inflow/(outflow) | ​ | (10) |  | (12) |  | (28) |  | (10) |  | (60)

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