Statement Of Changes In Net Assets Available For Benefits [Abstract]
| Concept |
2023-12-31 to 2024-12-28 |
2023-12-31 to 2024-12-28 |
2023-12-31 to 2024-12-28 |
2023-01-01 to 2023-12-30 |
2023-01-01 to 2023-12-30 |
2023-01-01 to 2023-12-30 |
|---|---|---|---|---|---|---|
| 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] | ||||||
| Other income |
13,800,000
GBP
|
13,800,000
GBP
|
–
GBP
|
20,300,000
GBP
|
–
GBP
|
20,300,000
GBP
|
| Administrative expenses |
97 .9
GBP
|
–
GBP
|
97 .9
GBP
|
–
GBP
|
82,900,000
GBP
|
82,900,000
GBP
|
| Tax expense (income) |
50,500,000
GBP
|
1,700,000
GBP
|
48,800,000
GBP
|
4,800,000
GBP
|
4 1.0
GBP
|
45,800,000
GBP
|