Statement Of Cash Flows [Abstract]
| Concept |
2024-04-01 to 2025-03-31 |
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 |
2024-04-01 to 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 |
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 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 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) |
247,100,000
GBP
|
–
GBP
|
–
GBP
|
— |
248,900,000
GBP
|
247,100,000
GBP
|
1,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
165,700,000
GBP
|
168,200,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
165,700,000
GBP
|
2,500,000
GBP
|
–
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||||||||
| Adjustments for income tax expense | — | — | — | — |
80,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
48,500,000
GBP
|
— | — | — | — | — | — | — |
| Adjustments for finance costs | — | — | — | — |
61,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
56,200,000
GBP
|
— | — | — | — | — | — | — |
| Adjustments for decrease (increase) in inventories | — | — | — | — |
25,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
67,100,000
GBP
|
— | — | — | — | — | — | — |
| Adjustments for provisions | — | — | — | — |
23,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
8,100,000
GBP
|
— | — | — | — | — | — | — |
| Adjustments for share-based payments | — | — | — | — |
14,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
12,400,000
GBP
|
— | — | — | — | — | — | — |
| Adjustments for fair value losses (gains) | — | — | — | — |
3,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) operations | — | — | — | — |
357,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
374,300,000
GBP
|
— | — | — | — | — | — | — |
| Interest paid, classified as operating activities | — | — | — | — |
55,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
54. 3
GBP
|
— | — | — | — | — | — | — |
| Interest received, classified as operating activities | — | — | — | — |
29,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
22,100,000
GBP
|
— | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — |
21,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
27,400,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — | — |
308,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
314,700,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — | — | — | — |
1,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,300,000
GBP
|
— | — | — | — | — | — | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — | — |
6,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
30,600,000
GBP
|
— | — | — | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — |
105,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
109,700,000
GBP
|
— | — | — | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — | — |
23,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
32,700,000
GBP
|
— | — | — | — | — | — | — |
| Cash advances and loans made to other parties, classified as investing activities | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
2,100,000
GBP
|
— | — | — | — | — | — | — |
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — |
7,500,000
GBP
|
— | — | — | — | — | — | — |
| Dividends received, classified as investing activities | — | — | — | — |
12,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
7,100,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — |
110 .8
GBP
|
— | — | — | — | — | — | — | — | — |
100,600,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||||
| Payments to acquire or redeem entity's shares | — | — | — | — |
18,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
12,500,000
GBP
|
— | — | — | — | — | — | — |
| Proceeds from borrowings, classified as financing activities | — | — | — | — |
7,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — | — |
8,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
13,100,000
GBP
|
— | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — |
45,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
49,600,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — |
92,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
85,500,000
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — |
105,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
128,600,000
GBP
|
— | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — |
11,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
5,500,000
GBP
|
— | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
646,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
570,600,000
GBP
|
— | — | — | — | — | — |