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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||
| Profit (loss) |
–
GBP
|
56,800,000
GBP
|
–
GBP
|
–
GBP
|
56,800,000
GBP
|
— |
–
GBP
|
–
GBP
|
— |
–
GBP
|
453,400,000
GBP
|
453,400,000
GBP
|
| Cash flows from (used in) operations | — | — | — | — |
1,061,600,000
GBP
|
— | — | — | — | — | — |
1,037,200,000
GBP
|
| Interest paid, classified as operating activities | — | — | — | — |
121,900,000
GBP
|
— | — | — | — | — | — |
136,700,000
GBP
|
| Interest received, classified as operating activities | — | — | — | — |
3,600,000
GBP
|
— | — | — | — | — | — |
7,400,000
GBP
|
| Cash flows from (used in) operating activities | — | — | — | — |
934,400,000
GBP
|
— | — | — | — | — | — |
859,400,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||||||||||||
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — |
609,000,000
GBP
|
— | — | — | — | — | — |
610,400,000
GBP
|
| Purchase of intangible assets, classified as investing activities | — | — | — | — |
19,500,000
GBP
|
— | — | — | — | — | — |
33,600,000
GBP
|
| Proceeds from government grants, classified as investing activities | — | — | — | — |
1,800,000
GBP
|
— | — | — | — | — | — |
5,000,000
GBP
|
| Cash flows from (used in) investing activities | — | — | — | — |
639,700,000
GBP
|
— | — | — | — | — | — |
549,300,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||||||||||||
| Payments to acquire or redeem entity's shares | — | — | — | — |
6,100,000
GBP
|
— | — | — | — | — | — |
4,000,000
GBP
|
| Repayments of borrowings, classified as financing activities | — | — | — | — |
681,800,000
GBP
|
— | — | — | — | — | — |
703,500,000
GBP
|
| Cash flows from (used in) financing activities | — | — | — | — |
809,700,000
GBP
|
— | — | — | — | — | — |
89,700,000
GBP
|
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — |
1,500,000
GBP
|
— | — | — | — | — | — |
–
GBP
|
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — | — | — |
513,500,000
GBP
|
— | — | — | — | — | — |
220,400,000
GBP
|
| Cash and cash equivalents | — | — | — | — | — |
240,900,000
GBP
|
— | — |
744,100,000
GBP
|
— | — | — |