Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2020-12-28 to 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 |
As at 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
2020-12-28 to 2021-12-26 |
As at 2020-12-27 |
As at 2020-12-27 |
As at 2020-12-27 |
As at 2020-12-27 |
As at 2020-12-27 |
As at 2020-12-27 |
As at 2020-12-27 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||
| Equity |
9,000,000
GBP
|
500,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,200,000
GBP
|
4 9.6
GBP
|
0. 5
GBP
|
112,800,000
GBP
|
1 56 .6
GBP
|
— |
2,300,000
GBP
|
105. 4
GBP
|
1,000,000
GBP
|
58,600,000
GBP
|
4 9.6
GBP
|
4,600,000
GBP
|
0. 5
GBP
|
— | — | — | — | — | — | — | — |
8,800,000
GBP
|
2 .4
GBP
|
4 9.6
GBP
|
48,200,000
GBP
|
9. 7
GBP
|
3. 4
GBP
|
0. 5
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — |
8 1.6
GBP
|
—
GBP
|
—
GBP
|
81,600,000
GBP
|
8 1.6
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — |
78,300,000
GBP
|
— | — | — | — | — | — | — |
78,300,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
15. 1
GBP
|
9 3 .4
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — |
—
GBP
|
1,500,000
GBP
|
— | — |
1,500,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — |
8,700,000
GBP
|
— | — | — | — | — | — | — |
—
GBP
|
—
GBP
|
—
GBP
|
8,700,000
GBP
|
— | — |
—
GBP
|
—
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income | — | — |
81,600,000
GBP
|
1,500,000
GBP
|
— | — |
8 3 .1
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — |
8 7. 0
GBP
|
— | — | — | — | — | — | — |
78,300,000
GBP
|
—
GBP
|
—
GBP
|
8,700,000
GBP
|
— | — |
—
GBP
|
—
GBP
|
— | — | — | — | — | — | — |
| Issue of equity | — | — |
—
GBP
|
—
GBP
|
— | — |
1 .6
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
1,600,000
GBP
|
— | — | — | — | — |
0 .4
GBP
|
— | — | — | — | — | — | — |
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — |
—
GBP
|
400,000
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — |
4 3. 8
GBP
|
—
GBP
|
— | — |
4 3. 8
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — |
56,000,000
GBP
|
— | — | — | — | — | — | — |
56,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — |
—
GBP
|
—
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — |
1,200,000
GBP
|
—
GBP
|
— | — |
1,200,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — |
1,700,000
GBP
|
— | — | — | — | — | — | — |
1,700,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — |
—
GBP
|
—
GBP
|
— | — | — | — | — | — | — |