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 |
As at 2022-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 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 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
300,700,000
GBP
|
–
GBP
|
–
GBP
|
300,700,000
GBP
|
— |
–
GBP
|
–
GBP
|
— |
–
GBP
|
267,400,000
GBP
|
267,400,000
GBP
|
–
GBP
|
267,400,000
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||
| Adjustments to reconcile profit (loss) | — | — | — | — | — |
294,800,000
GBP
|
— | — | — | — | — | — |
264,400,000
GBP
|
— | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — |
400,000
GBP
|
— | — | — | — | — | — |
0
GBP
|
— | — | — |
| Cash flows from (used in) operating activities | — | — | — | — | — |
212,200,000
GBP
|
— | — | — | — | — | — |
70,600,000
GBP
|
— | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — |
700,000
GBP
|
— | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — |
100,000
GBP
|
— | — | — | — | — | — |
100,000
GBP
|
— | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — |
100,000
GBP
|
— | — | — | — | — | — |
800,000
GBP
|
— | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||
| Proceeds from issuing shares | — | — | — | — | — |
111,200,000
GBP
|
— | — | — | — | — | — |
111,900,000
GBP
|
— | — | — |
| Payments to acquire or redeem entity's shares | — | — | — | — | — |
8,000,000
GBP
|
— | — | — | — | — | — |
2,300,000
GBP
|
— | — | — |
| Proceeds from borrowings, classified as financing activities | — | — | — | — | — |
30,000,000
GBP
|
— | — | — | — | — | — |
35,000,000
GBP
|
— | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — |
80,000,000
GBP
|
— | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — |
400,000
GBP
|
— | — | — | — | — | — |
400,000
GBP
|
— | — | — |
| Interest paid, classified as financing activities | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — |
2,200,000
GBP
|
— | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — |
128,100,000
GBP
|
— | — | — | — | — | — |
60,100,000
GBP
|
— | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — | — |
84,200,000
GBP
|
— | — | — | — | — | — |
129,900,000
GBP
|
— | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — | — |
1,600,000
GBP
|
— | — | — | — | — | — |
3,300,000
GBP
|
— | — | — |
| Cash and cash equivalents | — | — | — | — | — | — |
78,100,000
GBP
|
— | — |
160,700,000
GBP
|
— | — | — | — | — |
34,100,000
GBP
|