Statement Of Changes In Equity [Abstract]
| Concept |
As at 2023-03-25 |
As at 2023-03-25 |
As at 2023-03-25 |
As at 2023-03-25 |
As at 2023-03-25 |
2022-03-27 to 2023-03-25 |
2022-03-27 to 2023-03-25 |
2022-03-27 to 2023-03-25 |
2022-03-27 to 2023-03-25 |
2022-03-27 to 2023-03-25 |
2022-03-27 to 2023-03-25 |
2022-03-27 to 2023-03-25 |
2022-03-27 to 2023-03-25 |
As at 2023-03-25 |
As at 2023-03-25 |
As at 2023-03-25 |
2022-03-27 to 2023-03-25 |
As at 2023-03-25 |
2021-03-28 to 2022-03-26 |
2021-03-28 to 2022-03-26 |
2021-03-28 to 2022-03-26 |
2021-03-28 to 2022-03-26 |
2021-03-28 to 2022-03-26 |
2021-03-28 to 2022-03-26 |
2021-03-28 to 2022-03-26 |
2021-03-28 to 2022-03-26 |
2021-03-28 to 2022-03-26 |
As at 2022-03-26 |
As at 2022-03-26 |
As at 2022-03-26 |
As at 2022-03-26 |
As at 2022-03-26 |
As at 2022-03-26 |
As at 2022-03-26 |
As at 2022-03-26 |
As at 2022-03-26 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||
| Equity |
43,300,000
GBP
|
15,900,000
GBP
|
83,800,000
GBP
|
5 .9
GBP
|
9. 2
GBP
|
— | — | — | — | — | — | — | — |
35. 0
GBP
|
42,200,000
GBP
|
88,800,000
GBP
|
— |
100,000
GBP
|
— | — | — | — | — | — | — | — | — |
88,800,000
GBP
|
5,900,000
GBP
|
42,200,000
GBP
|
4,200,000
GBP
|
0 .5
GBP
|
161,800,000
GBP
|
31. 9
GBP
|
18. 0
GBP
|
35,100,000
GBP
|
31. 9
GBP
|
14,900,000
GBP
|
111,400,000
GBP
|
88,800,000
GBP
|
42,200,000
GBP
|
5 .7
GBP
|
0. 8
GBP
|
5,900,000
GBP
|
16 .4
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — |
1,300,000
GBP
|
55,900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
57 .2
GBP
|
— |
–
GBP
|
–
GBP
|
21,500,000
GBP
|
–
GBP
|
23. 7
GBP
|
2,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — |
–
GBP
|
76 .2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
5 .0
GBP
|
0. 6
GBP
|
–
GBP
|
— | — | — |
7 0.6
GBP
|
— |
–
GBP
|
–
GBP
|
2 7. 1
GBP
|
–
GBP
|
2 6.0
GBP
|
100,000
GBP
|
–
GBP
|
0. 3
GBP
|
1,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — | — |
1,300,000
GBP
|
132,100,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
5 .0
GBP
|
600,000
GBP
|
–
GBP
|
— | — | — |
127 .8
GBP
|
— |
–
GBP
|
–
GBP
|
48. 6
GBP
|
–
GBP
|
49,700,000
GBP
|
2,300,000
GBP
|
–
GBP
|
0. 3
GBP
|
1,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
0. 2
GBP
|
0. 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — | — | — |
0. 8
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
0. 8
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
900,000
GBP
|
900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — | — | — |
–
GBP
|
1 .9
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
1,900,000
GBP
|
— |
–
GBP
|
–
GBP
|
1 .7
GBP
|
–
GBP
|
1 .7
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |