Statement Of Changes In Net Assets Available For Benefits [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
|---|---|---|---|---|---|---|
| Statement of changes in net assets available for benefits [abstract] | ||||||
| Reconciliation of changes in net assets available for benefits [abstract] | ||||||
| Changes in net assets available for benefits [abstract] | ||||||
| Investment income |
29,100,000
GBP
|
29,100,000
GBP
|
–
GBP
|
29,300,000
GBP
|
29,300,000
GBP
|
–
GBP
|
| Other income |
300,000
GBP
|
300,000
GBP
|
–
GBP
|
3,200,000
GBP
|
3,200,000
GBP
|
–
GBP
|
| Tax expense (income) |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|