Statement Of Financial Position [Abstract]
| Concept |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2021-04-01 |
As at 2021-04-01 |
As at 2021-04-01 |
As at 2021-04-01 |
As at 2021-04-01 |
As at 2021-04-01 |
As at 2021-04-01 |
As at 2021-04-01 |
As at 2021-04-01 |
As at 2021-04-01 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment |
222,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
194,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Goodwill |
1,120,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
908,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill |
472,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
325,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets, non-current |
14,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
14,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
1,892,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,484,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Current inventories |
312,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
228,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables |
410,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
325,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets, current |
1,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
168,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
156,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
131,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets |
895,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
712,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
2,788,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,197,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Issued capital |
38,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
38,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
1,415,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,256,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
23,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
23,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares |
46,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
30,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
4,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
1,598,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,402,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
1,598,900,000
GBP
|
23,600,000
GBP
|
38,000,000
GBP
|
46,100,000
GBP
|
200,000
GBP
|
600,000
GBP
|
100,000
GBP
|
1,415,800,000
GBP
|
162,300,000
GBP
|
4,400,000
GBP
|
200,000
GBP
|
30,700,000
GBP
|
400,000
GBP
|
38,000,000
GBP
|
117,100,000
GBP
|
23,600,000
GBP
|
1,403,100,000
GBP
|
1,256,600,000
GBP
|
400,000
GBP
|
1,700,000
GBP
|
1,052,200,000
GBP
|
23,600,000
GBP
|
1,167,600,000
GBP
|
600,000
GBP
|
38,000,000
GBP
|
20,900,000
GBP
|
700,000
GBP
|
73,200,000
GBP
|
200,000
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
600,000
GBP
|
200,000
GBP
|
13,600,000
GBP
|
1,065,800,000
GBP
|
20,900,000
GBP
|
38,000,000
GBP
|
1,167,600,000
GBP
|
700,000
GBP
|
73,200,000
GBP
|
–
GBP
|
–
GBP
|
13,600,000
GBP
|
13,600,000
GBP
|
–
GBP
|
–
GBP
|
23,600,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Other non-current provisions |
9,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
7,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables |
21,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
19,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
70,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
58,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
848,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
430,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Current provisions [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Current provisions |
21,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
20,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
280,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
242,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax liabilities, current |
18,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
11,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
341,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
363,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
1,189,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
793,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |