Statement Of Changes In Equity [Abstract]
| Concept |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||
| Statement of changes in equity [line items] | ||||||||||||
| Dividends recognised as distributions to owners of parent |
–
GBP
|
–
GBP
|
–
GBP
|
98,500,000
GBP
|
–
GBP
|
98,500,000
GBP
|
451,500,000
GBP
|
–
GBP
|
–
GBP
|
451,500,000
GBP
|
–
GBP
|
–
GBP
|
| Decrease (increase) through tax on share-based payment transactions, equity |
–
GBP
|
–
GBP
|
–
GBP
|
9,800,000
GBP
|
–
GBP
|
9,800,000
GBP
|
3,800,000
GBP
|
–
GBP
|
–
GBP
|
3,800,000
GBP
|
–
GBP
|
–
GBP
|
| Purchase of treasury shares |
–
GBP
|
–
GBP
|
0. 2
GBP
|
155,400,000
GBP
|
0 .2
GBP
|
155,400,000
GBP
|
63,700,000
GBP
|
0. 1
GBP
|
-
GBP
|
63. 7
GBP
|
–
GBP
|
0 .1
GBP
|