Statement Of Changes In Net Assets Available For Benefits [Abstract]
| Concept |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2019-12-30 to 2020-12-27 |
2019-12-30 to 2020-12-27 |
2019-12-30 to 2020-12-27 |
|---|---|---|---|---|---|---|
| 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 |
–
GBP
|
2 .1
GBP
|
2 .1
GBP
|
7. 1
GBP
|
1,300,000
GBP
|
8 .4
GBP
|
| Administrative expenses |
4 . 5
GBP
|
1 2 9 . 9
GBP
|
1 2 5 . 4
GBP
|
4 .6
GBP
|
1 0 7. 5
GBP
|
1 1 2 .1
GBP
|
| Other expense, by function |
0. 3
GBP
|
0 . 3
GBP
|
–
GBP
|
4 .6
GBP
|
–
GBP
|
4 . 6
GBP
|
| Tax expense (income) |
1,500,000
GBP
|
1 9 . 0
GBP
|
20 . 5
GBP
|
0. 2
GBP
|
1 6 .9
GBP
|
1 6. 7
GBP
|