Statement Of Cash Flows [Abstract]
| Concept |
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 |
2021-04-01 to 2022-03-31 |
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 |
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 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||||||
| Profit (loss) |
–
GBP
|
3 , 5 47
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
466,000,000
GBP
|
–
GBP
|
4 , 0 13
GBP
|
— |
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
1, 7 0 7
GBP
|
–
GBP
|
1, 8 5 5
GBP
|
–
GBP
|
–
GBP
|
14 8
GBP
|
— |
| Interest received, classified as operating activities | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) operating activities | — | — | — | — | — | — | — |
49 0
GBP
|
— | — | — | — | — | — | — | — |
559,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||
| Proceeds from issuing shares | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — |
| Payments to acquire or redeem entity's shares | — | — | — | — | — | — | — |
5 4
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — |
| Proceeds from borrowings, classified as financing activities | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
395,000,000
GBP
|
— | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — |
5,000,000
GBP
|
— | — | — | — |
| Dividends paid, classified as financing activities | — | — | — | — | — | — | — |
3 89
GBP
|
— | — | — | — | — | — | — | — |
33 8
GBP
|
— | — | — | — |
| Interest paid, classified as financing activities | — | — | — | — | — | — | — |
52,000,000
GBP
|
— | — | — | — | — | — | — | — |
4 6
GBP
|
— | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — | — | — |
4 98
GBP
|
— | — | — | — | — | — | — | — |
7,000,000
GBP
|
— | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — | — | — | — |
8,000,000
GBP
|
— | — | — | — | — | — | — | — |
553,000,000
GBP
|
— | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — |
2,000,000
GBP
|
— | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — | — | — |
2 12
GBP
|
— |
2 16
GBP
|
— | — | — | — | — | — | — | — | — |
7 71
GBP
|