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Fair value estimation (Tables) | 12 Months Ended
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Dec. 31, 2024
Fair value estimation |
Summary of financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair value | ​ | Fair value | ​ | Fair value | ​ | Fair value
​ | ​ | assets | ​ | liabilities | ​ | assets | ​ | liabilities
​ | ​ | 2024 | ​ | 2024 | ​ | 2023 | ​ | 2023
​ |  | £m |  | £m |  | £m |  | £m
Interest rate swaps (level 2): |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
– non-hedge |  | — |  | — |  | — |  | (1)
– net investment hedge |  | 23 |  | (19) |  | 37 |  | (27)
– cash flow hedge |  | 1 |  | (28) |  | 24 |  | (11)
Foreign exchange swaps (level 2): |  | ​ |  | ​ |  | ​ | ​ | ​
– non-hedge |  | — |  | (3) |  | 1 |  | —
​ |  | 24 |  | (50) |  | 62 |  | (39)
Analysed as follows: |  | ​ | ​ | ​ |  | ​ | ​ | ​
Current portion |  | — |  | (3) |  | 5 |  | (23)
Non-current portion |  | 24 |  | (47) |  | 57 |  | (16)
Derivative financial instruments |  | 24 |  | (50) |  | 62 |  | (39)
Contingent consideration (including put option liability) (level 3) |  | — |  | (75) |  | — |  | (76)
Analysed as follows: |  | ​ |  | ​ | ​ | ​ | ​ | ​
Current portion |  | — |  | (37) |  | — |  | (36)
Non-current portion |  | — |  | (38) |  | — |  | (40)
Other payables |  | — |  | (75) |  | — |  | (76)
Summary of contingent consideration | ​
​ | ​ | ​ | ​ | ​
​ |  | Contingent |  | Contingent
​ | ​ | consideration | ​ | consideration
​ | ​ | 2024 | ​ | 2023
​ | ​ | £m | ​ | £m
At 1 January |  | 76 |  | 70
Exchange differences |  | (1) |  | (3)
Acquisitions |  | 31 |  | 41
Payments |  | (25) |  | (28)
Unused amount reversed | ​ | (7) | ​ | —
Revaluation of put option through equity |  | 1 |  | (4)
At 31 December |  | 75 |  | 76
Summary of maturity of financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Less than |  | Between |  | More than |  | ​
​ | ​ | 1 year | ​ | 1 and 5 years | ​ | 5 years | ​ | Total
​ | ​ | £m | ​ | £m | ​ | £m | ​ | £m
At 31 December 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-derivative financial instruments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Borrowings | ​ | (1,225) | ​ | (1,848) | ​ | (978) | ​ | (4,051)
​ | ​ | (1,225) | ​ | (1,848) | ​ | (978) | ​ | (4,051)
Derivative financial instruments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cross-currency interest rate swaps: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (47) |  | (1,695) |  | — |  | (1,742)
– inflow |  | 25 |  | 1,623 |  | — |  | 1,648
Foreign exchange swaps: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (363) |  | — |  | — |  | (363)
– inflow |  | 360 |  | — |  | — |  | 360
Foreign exchange forwards: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (11) |  | — |  | — |  | (11)
– inflow |  | 11 |  | — |  | — |  | 11
​ |  | (25) |  | (72) |  | — |  | (97)
Net outflow | ​ | (1,250) |  | (1,920) |  | (978) |  | (4,148)
At 31 December 2023 |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-derivative financial instruments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Borrowings | ​ | (1,209) | ​ | (2,601) | ​ | (1,003) | ​ | (4,812)
​ | ​ | (1,209) | ​ | (2,601) | ​ | (1,003) | ​ | (4,812)
Derivative financial instruments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cross-currency interest rate swaps: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (454) |  | (1,707) |  | — |  | (2,162)
– inflow |  | 400 |  | 1,703 |  | — |  | 2,103
Interest rate swaps: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (21) |  | — |  | — |  | (21)
– inflow |  | 31 |  | — |  | — |  | 31
Foreign exchange swaps: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
– outflow |  | (140) |  | — |  | — |  | (140)
– inflow |  | 140 |  | — |  | — |  | 140
​ |  | (44) |  | (4) |  | — |  | (49)
Net outflow | ​ | (1,253) |  | (2,605) |  | (1,003) |  | (4,861)
​

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