Statement Of Changes In Equity [Abstract]
| Concept |
2023-12-31 to 2024-12-28 |
2023-12-31 to 2024-12-28 |
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 |
2023-01-01 to 2023-12-30 |
2023-01-01 to 2023-12-30 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||
| Statement of changes in equity [line items] | ||||||||||
| Increase (decrease) through transactions with owners, equity |
–
GBP
|
–
GBP
|
102,800,000
GBP
|
–
GBP
|
102,800,000
GBP
|
–
GBP
|
2 .0
GBP
|
60. 0
GBP
|
58. 0
GBP
|
–
GBP
|
| Purchase of treasury shares |
–
GBP
|
–
GBP
|
5,000,000
GBP
|
–
GBP
|
5,000,000
GBP
|
–
GBP
|
–
GBP
|
5. 0
GBP
|
5,000,000
GBP
|
–
GBP
|
| Sale or issue of treasury shares |
–
GBP
|
–
GBP
|
4,700,000
GBP
|
–
GBP
|
4,700,000
GBP
|
–
GBP
|
–
GBP
|
1,600,000
GBP
|
1,600,000
GBP
|
–
GBP
|