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Retirement benefit obligations (Tables) | 12 Months Ended
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Dec. 31, 2024
Retirement benefit obligations |
Schedule of assumptions used for the RIPS | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 31 December |  | 31 December |
​ | ​ | 2024 | ​ | 2023 | ​
Weighted average % | ​ |  | ​ |  |
Discount rate |  | 3.5 | % | 3.5 | %
Future salary increases |  | n/a | ​ | n/a | ​
Future pension increases |  | 2.1 | % | 2.3 | %
Inflation |  | 2.1 | % | 2.3 | %
Schedule of movement in the net defined benefit obligation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Fair |  | ​ |  | ​ |  | Fair |  | ​
​ | ​ | Present | ​ | value of | ​ | ​ | ​ | Present | ​ | value of | ​ | ​
​ | ​ | value of | ​ | plan | ​ | ​ | ​ | value of | ​ | plan | ​ | ​
​ | ​ | obligation | ​ | assets | ​ | Total | ​ | obligation | ​ | assets | ​ | Total
​ | ​ | 2024 | ​ | 2024 | ​ | 2024 | ​ | 2023 | ​ | 2023 | ​ | 2023
​ | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m
At 1 January |  | (60) |  | 35 |  | (25) |  | (65) |  | 38 |  | (27)
Current service costs1 |  | (1) |  | — |  | (1) |  | (1) |  | — |  | (1)
Interest on defined benefit obligation/asset1 |  | (2) |  | 1 |  | (1) |  | (2) |  | 1 |  | (1)
Exchange difference |  | 2 |  | (2) |  | — |  | 2 |  | (1) |  | 1
Total pension income/(expense) |  | (1) |  | (1) |  | (2) |  | (1) |  | — |  | (1)
Remeasurements: |  |  |  |  |  |  |  |  |  |  |  |
– Remeasurement gain/(loss) on scheme assets |  | — |  | — |  | — |  | — |  | — |  | —
– Remeasurement gain/(loss) on obligation |  | — |  | — |  | — |  | — |  | — |  | —
Contributions: |  |  |  | ​ |  | ​ |  |  |  | ​ |  | ​
– Employers |  | (1) |  | 1 |  | — |  | (1) |  | 2 |  | 1
– Benefit payments |  | 6 |  | (1) |  | 5 |  | 7 |  | (5) |  | 2
At 31 December |  | (56) |  | 34 |  | (22) |  | (60) |  | 35 |  | (25)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Retirement benefit obligation schemes2 |  | (41) |  | 16 |  | (25) |  | (44) |  | 16 |  | (28)
Retirement benefit asset schemes3 |  | (15) |  | 18 |  | 3 |  | (16) |  | 19 |  | 3
1. | Service costs and administration expenses are charged to operating expenses, and interest cost and return on plan assets to finance cost and finance income.
2. | Benefit plans in an obligation position include plans situated in Austria, France, Germany, Hong Kong, India, Italy, Martinique, Norway, the Philippines, Saudi Arabia, South Africa, South Korea, Sri Lanka, Thailand, Trinidad and Tobago, and the UK.
3. | Benefit plans in an asset position include plans situated in Australia, Barbados, and Ireland.
Schedule of analysis of fair value of plan assets | ​
​ | ​ | ​ | ​ | ​
​ |  | 2024 |  | 2023
​ | ​ | £m | ​ | £m
Equity instruments |  | 3 |  | 2
Debt instruments – unquoted |  | 14 |  | 15
Property |  | 1 |  | 1
Other |  | 16 |  | 17
Total plan assets |  | 34 |  | 35

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- Definition The disclosure of a net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_a&doctype=Standard -URIDate 2024-03-27 + Details
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