Statement Of Cash Flows [Abstract]
| Concept |
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 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
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 |
As at 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
183,700,000
GBP
|
183,700,000
GBP
|
— |
–
GBP
|
–
GBP
|
183,700,000
GBP
|
–
GBP
|
284,800,000
GBP
|
284,800,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
284,800,000
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||
| Adjustments for decrease (increase) in inventories | — | — | — |
4,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
44,300,000
GBP
|
— |
| Adjustments for depreciation and amortisation expense | — | — | — |
83,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
64,600,000
GBP
|
— |
| Adjustments for provisions | — | — | — |
1,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,400,000
GBP
|
— |
| Adjustments for share-based payments | — | — | — |
7,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
14,200,000
GBP
|
— |
| Adjustments for losses (gains) on disposal of non-current assets | — | — | — |
1,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
4,400,000
GBP
|
— |
| Cash flows from (used in) operations | — | — | — |
300,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
413,000,000
GBP
|
— |
| Interest paid, classified as operating activities | — | — | — |
35,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
14,600,000
GBP
|
— |
| Interest received, classified as operating activities | — | — | — |
4,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — | — | — |
73,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
93,900,000
GBP
|
— |
| Cash flows from (used in) operating activities | — | — | — |
196,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
306,500,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — |
313,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
237,200,000
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
100,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — |
15,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
18,600,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — | — | — |
35,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
27,500,000
GBP
|
— |
| Cash flows from (used in) investing activities | — | — | — |
355,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
270,500,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||
| Proceeds from issuing shares | — | — | — |
3,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
4,800,000
GBP
|
— |
| Payments to acquire or redeem entity's shares | — | — | — |
1,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,100,000
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — | — | — |
286,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
83,200,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — | — | — |
27,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
58,100,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — | — | — |
18,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
18,800,000
GBP
|
— |
| Dividends paid, classified as financing activities | — | — | — |
104,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
88,600,000
GBP
|
— |
| Cash flows from (used in) financing activities | — | — | — |
138,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
79,600,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — |
20,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
43,600,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — |
4,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
5,700,000
GBP
|
— |
| Cash and cash equivalents | — | — | — | — |
96,000,000
GBP
|
— | — | — | — | — | — |
120,500,000
GBP
|
— | — | — | — |
158,400,000
GBP
|