Statement Of Cash Flows [Abstract]
| Concept |
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 |
As at 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
–
GBP
|
132,200,000
GBP
|
132,200,000
GBP
|
–
GBP
|
87,200,000
GBP
|
–
GBP
|
–
GBP
|
87,200,000
GBP
|
— |
| Cash flows from (used in) operations | — | — | — | — | — |
753,300,000
GBP
|
— | — | — | — |
891,700,000
GBP
|
— |
| Cash flows from (used in) operating activities | — | — | — | — | — |
749,300,000
GBP
|
— | — | — | — |
890,500,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — | — | — |
400,000
GBP
|
— | — | — | — |
–
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — | — | — |
12,900,000
GBP
|
— | — | — | — |
9,500,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — |
699,700,000
GBP
|
— | — | — | — |
610,300,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — | — | — | — | — |
40,000,000
GBP
|
— | — | — | — |
36,300,000
GBP
|
— |
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities | — | — | — | — | — |
5,500,000
GBP
|
— | — | — | — |
–
GBP
|
— |
| Interest received, classified as investing activities | — | — | — | — | — |
5,500,000
GBP
|
— | — | — | — |
1,900,000
GBP
|
— |
| Cash flows from (used in) investing activities | — | — | — | — | — |
716,200,000
GBP
|
— | — | — | — |
648,200,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||
| Proceeds from issuing shares | — | — | — | — | — |
15,300,000
GBP
|
— | — | — | — |
257,200,000
GBP
|
— |
| Payments to acquire or redeem entity's shares | — | — | — | — | — |
1,800,000
GBP
|
— | — | — | — |
–
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — | — | — | — | — |
1,351,400,000
GBP
|
— | — | — | — |
501,000,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — | — | — | — | — |
982,400,000
GBP
|
— | — | — | — |
488,900,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — |
13,100,000
GBP
|
— | — | — | — |
12,100,000
GBP
|
— |
| Interest paid, classified as financing activities | — | — | — | — | — |
205,300,000
GBP
|
— | — | — | — |
182,900,000
GBP
|
— |
| Cash flows from (used in) financing activities | — | — | — | — | — |
112,100,000
GBP
|
— | — | — | — |
178,600,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — | — | — | — |
79,000,000
GBP
|
— | — | — | — |
63,700,000
GBP
|
— |
| Cash and cash equivalents |
34,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
115,400,000
GBP
|