Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
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] | |||||
| 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
|