Statement Of Cash Flows [Abstract]
| Concept |
As at 2025-03-31 |
2024-04-01 to 2025-03-31 |
2023-04-01 to 2024-03-31 |
As at 2024-03-31 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| 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
|