Statement Of Changes In Net Assets Available For Benefits [Abstract]
| Concept |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|
| 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 |
22 .0
GBP
|
5 3 .7
GBP
|
—
GBP
|
5 3 .7
GBP
|
| Tax expense (income) |
6,000,000
GBP
|
2 .9
GBP
|
—
GBP
|
2 .9
GBP
|