Statement Of Changes In Equity [Abstract]
| Concept |
As at 2023-12-31 |
2022-12-26 to 2023-12-31 |
2022-12-26 to 2023-12-31 |
As at 2023-12-31 |
2022-12-26 to 2023-12-31 |
2022-12-26 to 2023-12-31 |
As at 2023-12-31 |
2022-12-26 to 2023-12-31 |
As at 2023-12-31 |
2022-12-26 to 2023-12-31 |
2022-12-26 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2022-12-26 to 2023-12-31 |
2022-12-26 to 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-25 |
As at 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
2021-12-27 to 2022-12-25 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||
| Equity |
134,000,000
GBP
|
— | — |
171,100,000
GBP
|
— | — |
500,000
GBP
|
— |
49,600,000
GBP
|
— | — |
2,100,000
GBP
|
2,600,000
GBP
|
— | — |
12,500,000
GBP
|
9,000,000
GBP
|
500,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,200,000
GBP
|
49,600,000
GBP
|
500,000
GBP
|
112,800,000
GBP
|
156,600,000
GBP
|
2,300,000
GBP
|
105,400,000
GBP
|
1,000,000
GBP
|
49,600,000
GBP
|
4,600,000
GBP
|
500,000
GBP
|
58,600,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
39,300,000
GBP
|
75,700,000
GBP
|
— |
–
GBP
|
–
GBP
|
— |
115,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
115,000,000
GBP
|
— | — | — |
81,600,000
GBP
|
–
GBP
|
–
GBP
|
81,600,000
GBP
|
81,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — |
3,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — |
3,100,000
GBP
|
–
GBP
|
— |
111,900,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
115,000,000
GBP
|
— | — | — |
81,600,000
GBP
|
1,500,000
GBP
|
— | — |
83,100,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — |
–
GBP
|
500,000
GBP
|
— |
500,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— | — |
1,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — |
–
GBP
|
–
GBP
|
— |
41,900,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
41,900,000
GBP
|
— | — | — |
43,800,000
GBP
|
–
GBP
|
— | — |
43,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — |
–
GBP
|
–
GBP
|
— |
3,800,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
3,800,000
GBP
|
— | — | — |
1,200,000
GBP
|
–
GBP
|
— | — |
1,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |