Statement Of Cash Flows [Abstract]
| Concept |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
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 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||
| Profit (loss) |
243,400,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
243,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
300,700,000
GBP
|
–
GBP
|
–
GBP
|
300,700,000
GBP
|
— | — |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||
| Adjustments to reconcile profit (loss) |
241,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
294,800,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
400,000
GBP
|
— | — |
| Cash flows from (used in) operating activities |
108,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
212,200,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||
| Purchase of property, plant and equipment, classified as investing activities |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
100,000
GBP
|
— | — |
| Cash flows from (used in) investing activities |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
100,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||
| Proceeds from issuing shares |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
111,200,000
GBP
|
— | — |
| Payments to acquire or redeem entity's shares |
600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
8,000,000
GBP
|
— | — |
| Proceeds from borrowings, classified as financing activities |
125,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
30,000,000
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities |
65,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities |
400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
400,000
GBP
|
— | — |
| Interest paid, classified as financing activities |
6,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — |
| Cash flows from (used in) financing activities |
51,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
128,100,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
56,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
84,200,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents |
1,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,600,000
GBP
|
— | — |
| Cash and cash equivalents | — |
22,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
78,100,000
GBP
|
160,700,000
GBP
|