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 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 2022-03-31 |
As at 2022-03-31 |
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 | — | — | — |
20,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
32,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — |
69,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
86,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Goodwill | — | — | — |
28,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
28,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — |
9,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
12,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables | — | — | — |
93,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
92,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — |
8,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — |
229,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
261,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Current inventories | — | — | — |
73,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
97,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables | — | — | — |
137,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
169,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets, current | — | — | — |
600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
19,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
19,500,000
GBP
|
— | — | — | — | — | — |
67,100,000
GBP
|
— | — | — | — | — | — | — |
| Current assets | — | — | — |
230,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
288,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — |
460,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
549,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Issued capital | — | — | — |
1,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — |
63,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
60,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — |
108,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
104,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — |
59,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
28,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — |
105,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
73,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
15,500,000
GBP
|
105,700,000
GBP
|
6,300,000
GBP
|
105,700,000
GBP
|
108,200,000
GBP
|
1,400,000
GBP
|
–
GBP
|
500,000
GBP
|
–
GBP
|
63,300,000
GBP
|
59,200,000
GBP
|
9,400,000
GBP
|
500,000
GBP
|
3,000,000
GBP
|
–
GBP
|
73,400,000
GBP
|
22,200,000
GBP
|
1,200,000
GBP
|
3,000,000
GBP
|
104,400,000
GBP
|
60,700,000
GBP
|
72,400,000
GBP
|
1,000,000
GBP
|
11,800,000
GBP
|
9,600,000
GBP
|
500,000
GBP
|
–
GBP
|
33,100,000
GBP
|
96,400,000
GBP
|
22,200,000
GBP
|
1,200,000
GBP
|
104,300,000
GBP
|
1,300,000
GBP
|
97,700,000
GBP
|
3,000,000
GBP
|
4,000,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current provisions | — | — | — |
3,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables | — | — | — |
4,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
6,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — |
76,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
97,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||||||||||||||||||||
| Current provisions | — | — | — |
1,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables | — | — | — |
249,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
313,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — |
278,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
379,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
354,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
476,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |