Statement Of Cash Flows [Abstract]
| Concept |
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 |
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 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||
| Profit (loss) |
284,800,000
GBP
|
284,800,000
GBP
|
–
GBP
|
— |
–
GBP
|
284,800,000
GBP
|
–
GBP
|
–
GBP
|
230,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
230,000,000
GBP
|
–
GBP
|
230,000,000
GBP
|
— | — |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||
| Adjustments for decrease (increase) in inventories |
44,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
102,100,000
GBP
|
— | — |
| Adjustments for depreciation and amortisation expense |
64,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
63,700,000
GBP
|
— | — |
| Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss |
7,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — |
| Adjustments for provisions |
1,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,700,000
GBP
|
— | — |
| Adjustments for share-based payments |
14,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
9,900,000
GBP
|
— | — |
| Adjustments for losses (gains) on disposal of non-current assets |
4,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
2,400,000
GBP
|
— | — |
| Cash flows from (used in) operations |
413,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
267,100,000
GBP
|
— | — |
| Interest paid, classified as operating activities |
14,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
8,000,000
GBP
|
— | — |
| Interest received, classified as operating activities |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities |
93,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
57,100,000
GBP
|
— | — |
| Cash flows from (used in) operating activities |
306,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
203,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |
237,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
2,200,000
GBP
|
— | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities |
100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — |
| Purchase of property, plant and equipment, classified as investing activities |
18,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
17,700,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities |
27,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
24,800,000
GBP
|
— | — |
| Cash flows from (used in) investing activities |
270,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
40,300,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||
| Proceeds from issuing shares |
4,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
3,000,000
GBP
|
— | — |
| Payments to acquire or redeem entity's shares |
2,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
2,900,000
GBP
|
— | — |
| Proceeds from borrowings, classified as financing activities |
83,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities |
58,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
700,000
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities |
18,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
17,800,000
GBP
|
— | — |
| Dividends paid, classified as financing activities |
88,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
76,200,000
GBP
|
— | — |
| Cash flows from (used in) financing activities |
79,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
94,600,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
43,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
68,100,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents |
5,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
3,900,000
GBP
|
— | — |
| Cash and cash equivalents | — | — | — |
120,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
158,400,000
GBP
|
86,400,000
GBP
|