Statement Of Cash Flows [Abstract]
| Concept |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
As at 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
As at 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
— |
264,700,000
GBP
|
–
GBP
|
264,700,000
GBP
|
–
GBP
|
126,900,000
GBP
|
126,900,000
GBP
|
— |
–
GBP
|
–
GBP
|
| Cash flows from (used in) operations | — | — | — |
1,082,700,000
GBP
|
— | — | — | — |
865,400,000
GBP
|
— | — | — |
| Interest paid, classified as operating activities | — | — | — |
263,500,000
GBP
|
— | — | — | — |
175,600,000
GBP
|
— | — | — |
| Interest received, classified as operating activities | — | — | — |
92,500,000
GBP
|
— | — | — | — |
50,700,000
GBP
|
— | — | — |
| Cash flows from (used in) operating activities | — | — | — |
918,100,000
GBP
|
— | — | — | — |
745,100,000
GBP
|
— | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — |
1,100,000
GBP
|
— | — | — | — |
4,800,000
GBP
|
— | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — |
988,500,000
GBP
|
— | — | — | — |
749,500,000
GBP
|
— | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — |
9,500,000
GBP
|
— | — | — | — |
14,600,000
GBP
|
— | — | — |
| Proceeds from government grants, classified as investing activities | — | — | — |
9,200,000
GBP
|
— | — | — | — |
27,900,000
GBP
|
— | — | — |
| Cash flows from (used in) investing activities | — | — | — |
987,200,000
GBP
|
— | — | — | — |
731,400,000
GBP
|
— | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||
| Payments to acquire or redeem entity's shares | — | — | — |
5,000,000
GBP
|
— | — | — | — |
3,800,000
GBP
|
— | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — |
631,400,000
GBP
|
— | — | — | — |
248,500,000
GBP
|
— | — | — |
| Cash flows from (used in) financing activities | — | — | — |
358,800,000
GBP
|
— | — | — | — |
1,037,700,000
GBP
|
— | — | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — | — |
289,700,000
GBP
|
— | — | — | — |
1,051,400,000
GBP
|
— | — | — |
| Cash and cash equivalents | — | — |
1,672,600,000
GBP
|
— | — | — | — | — | — |
1,399,300,000
GBP
|
— | — |