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Pensions - Sensitivities of the present value of defined benefit obligation (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Pensions |  |
Weighted average duration of defined benefit obligation | 13 years | 14 years
Main Pension Scheme |  |
Pensions |  |
Active members | 6.90% | 7.50%
Deferred members | 40.70% | 41.90%
Pensioners and dependants | 52.40% | 50.60%
Total proportions to the different classes of scheme | 100.00% | 100.00%
Discount rate | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.50% | 0.50%
(Decrease)/ increase in value of assets | £ (1,554) | £ (2,292)
(Decrease)/ increase in value of liabilities | 1,529 | 1,746
Increase in net pension (obligations)/assets | £ 25 | £ 546
Inflation | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of assets | £ 648 | £ 811
(Decrease)/ increase in value of liabilities | (571) | (578)
Increase in net pension (obligations)/assets | £ (77) | £ (233)
Credit spreads | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.50% | 0.50%
Decrease in actuarial assumption (as a percent) | 50.00% | 50.00%
(Decrease)/ increase in value of assets | £ (4) | £ (12)
(Decrease)/ increase in value of liabilities | 1,529 | 1,746
Increase in net pension (obligations)/assets | £ (1,525) | £ (1,734)
Percentage of larger reasonably possible increase in actuarial assumption | 0.50% | 0.50%
Credit spreads | Actuarial assumption of longevity, decrease by 2 years | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | £ 3,100 | £ 3,500
Net pension assets/obligations, assuming no change in one of the actuarial assumption | 1,700 | 1,900
Increase in net pension (obligations)/assets | 200 |
Credit spreads | Actuarial assumption of longevity, decrease by 1 year | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | 2,300 | 2,600
Net pension assets/obligations, assuming no change in one of the actuarial assumption | 900 | 900
Increase in net pension (obligations)/assets | (700) | (1,000)
Credit spreads | Actuarial assumption of longevity, no change | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | 1,500 | 1,700
Increase in net pension (obligations)/assets | (1,700) | (2,000)
Credit spreads | Actuarial assumption of longevity, increase by 1 year | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets | 700 | 900
Net pension assets/obligations, assuming no change in one of the actuarial assumption | (800) | (900)
Increase in net pension (obligations)/assets | (2,500) | (2,900)
Credit spreads | Actuarial assumption of longevity, increase by 2 years | Main Pension Scheme |  |
Pensions |  |
Increase in net pension (obligations)/assets |  | 100
Net pension assets/obligations, assuming no change in one of the actuarial assumption | (1,700) | (1,800)
Increase in net pension (obligations)/assets | £ (3,400) | £ (3,900)
Longevity increase | Main Pension Scheme |  |
Pensions |  |
Actuarial assumption of longevity increase | 1 year | 1 year
(Decrease)/ increase in value of assets | £ 295 |
(Decrease)/ increase in value of liabilities | (832) | £ (902)
Increase in net pension (obligations)/assets | £ 537 | £ 902
Pension increase | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 0.25% | 0.25%
(Decrease)/ increase in value of assets | £ 205 |
(Decrease)/ increase in value of liabilities | (605) | £ (706)
Increase in net pension (obligations)/assets | £ 400 | £ 706
Equity values | Main Pension Scheme |  |
Pensions |  |
Increase in actuarial assumption (as a percent) | 10.00% | 10.00%
(Decrease)/ increase in value of assets | £ 199 | £ 229
Increase in net pension (obligations)/assets | £ (199) | £ (229)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
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