Statement Of Changes In Equity [Abstract]
| Concept |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||
| Statement of changes in equity [line items] | ||||||||
| Sale or issue of treasury shares |
–
GBP
|
–
GBP
|
–
GBP
|
0 .6
GBP
|
–
GBP
|
–
GBP
|
3 7. 2
GBP
|
3 7. 8
GBP
|
| Reduction of issued capital |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1, 390.0
GBP
|
–
GBP
|
1, 390.0
GBP
|
–
GBP
|