Statement Of Changes In Equity [Abstract]
| Concept |
As at 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 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 |
As at 2021-03-31 |
As at 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity |
49. 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
9, 1 33 . 2
GBP
|
536. 5
GBP
|
6,600,000
GBP
|
835. 1
GBP
|
7 7. 5
GBP
|
6 , 57 7. 3
GBP
|
8, 08 2.2
GBP
|
1 ,051 .0
GBP
|
— |
9, 17 3 . 8
GBP
|
40 .6
GBP
|
— |
49. 2
GBP
|
1 , 47 2 . 4
GBP
|
1 33.6
GBP
|
3 ,921 . 1
GBP
|
6 ,681 . 1
GBP
|
— | — | — |
524. 5
GBP
|
–
GBP
|
8 47. 1
GBP
|
400,000
GBP
|
— | — | — | — | — |
6,68 1 . 1
GBP
|
5, 208.7
GBP
|
— | — | — |
1 , 169.7
GBP
|
111,100,000
GBP
|
3,750,400,000
GBP
|
4,92 0. 1
GBP
|
6,400,000
GBP
|
49. 2
GBP
|
875,600,000
GBP
|
523. 1
GBP
|
2 , 4 07. 2
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
–
GBP
|
3 ,031 . 4
GBP
|
2,02 5. 3
GBP
|
1 ,056 . 8
GBP
|
3,0 82 . 1
GBP
|
50,700,000
GBP
|
–
GBP
|
–
GBP
|
3 ,031 . 4
GBP
|
— | — | — | — | — | — | — | — |
3,08 2 . 1
GBP
|
— | — |
–
GBP
|
— | — | — | — | — |
4 6.6
GBP
|
–
GBP
|
2, 2 76 . 2
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
9 40. 3
GBP
|
1 , 382. 5
GBP
|
2, 322.8
GBP
|
— | — |
–
GBP
|
–
GBP
|
2, 2 76 . 2
GBP
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
–
GBP
|
6,200,000
GBP
|
123,000,000
GBP
|
— | — |
340. 3
GBP
|
–
GBP
|
–
GBP
|
211 . 1
GBP
|
340. 3
GBP
|
— | — | — | — | — | — | — | — |
340. 3
GBP
|
— | — |
–
GBP
|
— | — | — | — | — |
–
GBP
|
16 . 3
GBP
|
57 .3
GBP
|
— | — | — | — |
6,000,000
GBP
|
–
GBP
|
— | — |
57,300,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
35 .0
GBP
|
— | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
–
GBP
|
6,200,000
GBP
|
3,15 4.4
GBP
|
— | — |
3,422 .4
GBP
|
50,700,000
GBP
|
–
GBP
|
211 . 1
GBP
|
3, 371 .7
GBP
|
— | — | — | — | — | — | — | — |
3,422 .4
GBP
|
— | — |
–
GBP
|
— | — | — | — | — |
46 .6
GBP
|
16 . 3
GBP
|
2 , 2 18 .9
GBP
|
— | — | — | — |
6 .0
GBP
|
–
GBP
|
— | — |
2, 265 . 5
GBP
|
— | — |
–
GBP
|
–
GBP
|
2,2 41.2
GBP
|
— | — | — | — | — | — | — | — | — |
| Issue of equity | — |
–
GBP
|
–
GBP
|
–
GBP
|
6,300,000
GBP
|
— | — |
6. 3
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
6,300,000
GBP
|
— | — | — | — | — | — | — | — |
6,300,000
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
–
GBP
|
–
GBP
|
8 62 . 3
GBP
|
— | — |
8 62 . 3
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
862 . 3
GBP
|
— | — | — | — | — | — | — | — |
862 . 3
GBP
|
— | — |
–
GBP
|
— | — | — | — | — |
–
GBP
|
–
GBP
|
836 .4
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
— | — |
836,400,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
836,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
–
GBP
|
–
GBP
|
20,800,000
GBP
|
— | — |
20. 8
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
20,800,000
GBP
|
— | — | — | — | — | — | — | — |
20,800,000
GBP
|
— | — |
–
GBP
|
— | — | — | — | — |
–
GBP
|
–
GBP
|
1 9.7
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
— | — |
1 9. 7
GBP
|
— | — |
–
GBP
|
–
GBP
|
1 9.7
GBP
|
— | — | — | — | — | — | — | — | — |