Statement Of Changes In Equity [Abstract]
| Concept |
As at 2024-12-29 |
As at 2024-12-29 |
As at 2024-12-29 |
As at 2024-12-29 |
As at 2024-12-29 |
As at 2024-12-29 |
As at 2024-12-29 |
As at 2024-12-29 |
2024-01-01 to 2024-12-29 |
2024-01-01 to 2024-12-29 |
2024-01-01 to 2024-12-29 |
2024-01-01 to 2024-12-29 |
2024-01-01 to 2024-12-29 |
2024-01-01 to 2024-12-29 |
2024-01-01 to 2024-12-29 |
2024-01-01 to 2024-12-29 |
2024-01-01 to 2024-12-29 |
2024-01-01 to 2024-12-29 |
As at 2024-12-29 |
As at 2024-12-29 |
As at 2023-12-31 |
2023-01-02 to 2023-12-31 |
2023-01-02 to 2023-12-31 |
2023-01-02 to 2023-12-31 |
2023-01-02 to 2023-12-31 |
2023-01-02 to 2023-12-31 |
As at 2023-12-31 |
2023-01-02 to 2023-12-31 |
2023-01-02 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-02 to 2023-12-31 |
2023-01-02 to 2023-12-31 |
2023-01-02 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity |
184 .0
GBP
|
9,000,000
GBP
|
144,900,000
GBP
|
12,100,000
GBP
|
9,000,000
GBP
|
30,800,000
GBP
|
2,600,000
GBP
|
306,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
10. 2
GBP
|
316,800,000
GBP
|
321,500,000
GBP
|
— | — | — | — | — |
30,800,000
GBP
|
— | — |
1 76 .0
GBP
|
11,200,000
GBP
|
— | — | — |
144,900,000
GBP
|
9,000,000
GBP
|
3,000,000
GBP
|
310,300,000
GBP
|
7. 4
GBP
|
6,800,000
GBP
|
167 .9
GBP
|
5,000,000
GBP
|
2,400,000
GBP
|
30,800,000
GBP
|
11,000,000
GBP
|
294,400,000
GBP
|
0. 8
GBP
|
9,000,000
GBP
|
144,900,000
GBP
|
305,400,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — | — | — |
2,300,000
GBP
|
3 9.3
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
39. 3
GBP
|
41,600,000
GBP
|
— | — | — |
3 6.4
GBP
|
–
GBP
|
1,600,000
GBP
|
3 6.4
GBP
|
38 .0
GBP
|
— |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
14. 2
GBP
|
— | — | — | — | — | — | — |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — | — | — | — |
2 .0
GBP
|
25,400,000
GBP
|
9,100,000
GBP
|
–
GBP
|
–
GBP
|
4 . 8
GBP
|
–
GBP
|
–
GBP
|
3 9.3
GBP
|
2 7. 4
GBP
|
— | — | — |
36 .4
GBP
|
–
GBP
|
1,600,000
GBP
|
42,400,000
GBP
|
44 .0
GBP
|
— |
–
GBP
|
–
GBP
|
— | — |
600,000
GBP
|
–
GBP
|
6,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — | — | — | — |
2,900,000
GBP
|
29,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
29,200,000
GBP
|
32,100,000
GBP
|
— | — | — |
28 .3
GBP
|
–
GBP
|
1,500,000
GBP
|
28,300,000
GBP
|
29,800,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — | — | — | — |
–
GBP
|
2 .0
GBP
|
–
GBP
|
2,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
2,000,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
1,800,000
GBP
|
1. 8
GBP
|
— |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
1. 8
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |