Statement Of Changes In Equity [Abstract]
| Concept |
As at 2022-03-31 |
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 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 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||||||||
| Equity |
1 61. 8
GBP
|
— | — | — | — | — | — | — | — | — |
31. 9
GBP
|
14 . 9
GBP
|
111 . 4
GBP
|
88,800,000
GBP
|
42 . 2
GBP
|
5 .7
GBP
|
0. 8
GBP
|
5,900,000
GBP
|
16. 4
GBP
|
— | — | — | — | — | — | — | — | — |
161. 8
GBP
|
88,800,000
GBP
|
3 5 .1
GBP
|
42. 2
GBP
|
500,000
GBP
|
4. 2
GBP
|
3 1. 9
GBP
|
5,900,000
GBP
|
18 . 0
GBP
|
42. 2
GBP
|
4 7. 8
GBP
|
0 .1
GBP
|
8 3.8
GBP
|
9 3.2
GBP
|
9,600,000
GBP
|
56,200,000
GBP
|
15 . 2
GBP
|
5,900,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
2 1. 5
GBP
|
–
GBP
|
2 3 .7
GBP
|
2,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
8 .1
GBP
|
2. 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
5,900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
–
GBP
|
2 7. 1
GBP
|
–
GBP
|
26,000,000
GBP
|
0 .1
GBP
|
–
GBP
|
1. 5
GBP
|
300,000
GBP
|
— | — | — | — | — | — | — | — | — |
8 2. 2
GBP
|
–
GBP
|
3,900,000
GBP
|
–
GBP
|
900,000
GBP
|
7 7. 4
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
–
GBP
|
4 8.6
GBP
|
–
GBP
|
4 9.7
GBP
|
2,300,000
GBP
|
–
GBP
|
1. 5
GBP
|
300,000
GBP
|
— | — | — | — | — | — | — | — | — |
74 .1
GBP
|
2. 2
GBP
|
3,900,000
GBP
|
–
GBP
|
900,000
GBP
|
7 1 .5
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
200,000
GBP
|
200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
900,000
GBP
|
900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
1. 0
GBP
|
1. 0
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
–
GBP
|
1. 7
GBP
|
–
GBP
|
1,700,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
0. 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |