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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment |
59. 3
GBP
|
— | — | — | — | — | — | — | — | — |
31 .7
GBP
|
— | — | — | — | — | — | — |
| Right-of-use assets |
31 .4
GBP
|
— | — | — | — | — | — | — | — | — |
1 7. 9
GBP
|
— | — | — | — | — | — | — |
| Trade and other non-current receivables |
0. 5
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Deferred tax assets |
12,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
13 .7
GBP
|
— | — | — | — | — | — | — |
| Non-current assets |
262 .6
GBP
|
— | — | — | — | — | — | — | — | — |
255 .7
GBP
|
— | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Current inventories |
81 .4
GBP
|
— | — | — | — | — | — | — | — | — |
65. 3
GBP
|
— | — | — | — | — | — | — |
| Trade and other current receivables |
113 . 2
GBP
|
— | — | — | — | — | — | — | — | — |
94,800,000
GBP
|
— | — | — | — | — | — | — |
| Cash and cash equivalents |
112 . 7
GBP
|
— | — | — | — | — | — | — | — | — |
96,400,000
GBP
|
— | — | — | — | — | — | — |
| Current assets |
309. 4
GBP
|
— | — | — | — | — | — | — | — | — |
258 . 3
GBP
|
— | — | — | — | — | — | — |
| Assets |
572 .0
GBP
|
— | — | — | — | — | — | — | — | — |
514. 0
GBP
|
— | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital |
2 .9
GBP
|
— | — | — | — | — | — | — | — | — |
2,900,000
GBP
|
— | — | — | — | — | — | — |
| Retained earnings |
265,400,000
GBP
|
— | — | — | — | — | — | — | — | — |
243 . 2
GBP
|
— | — | — | — | — | — | — |
| Share premium |
62 .6
GBP
|
— | — | — | — | — | — | — | — | — |
62 .5
GBP
|
— | — | — | — | — | — | — |
| Other reserves |
0. 2
GBP
|
— | — | — | — | — | — | — | — | — |
0. 2
GBP
|
— | — | — | — | — | — | — |
| Equity |
344 .0
GBP
|
12 .9
GBP
|
62 .6
GBP
|
2 .9
GBP
|
265,400,000
GBP
|
0. 2
GBP
|
2,900,000
GBP
|
62. 5
GBP
|
7. 6
GBP
|
243 . 2
GBP
|
316. 4
GBP
|
0. 2
GBP
|
6,600,000
GBP
|
194. 1
GBP
|
0. 2
GBP
|
62 . 4
GBP
|
266. 2
GBP
|
2 .9
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||
| Non-current provisions |
–
GBP
|
— | — | — | — | — | — | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — |
| Deferred tax liabilities |
7. 8
GBP
|
— | — | — | — | — | — | — | — | — |
15,400,000
GBP
|
— | — | — | — | — | — | — |
| Non-current liabilities |
34,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
32,000,000
GBP
|
— | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||
| Current provisions |
7. 6
GBP
|
— | — | — | — | — | — | — | — | — |
7. 7
GBP
|
— | — | — | — | — | — | — |
| Trade and other current payables |
1 59.4
GBP
|
— | — | — | — | — | — | — | — | — |
13 9.6
GBP
|
— | — | — | — | — | — | — |
| Current liabilities |
193 .1
GBP
|
— | — | — | — | — | — | — | — | — |
165 .6
GBP
|
— | — | — | — | — | — | — |
| Liabilities |
228 .0
GBP
|
— | — | — | — | — | — | — | — | — |
19 7. 6
GBP
|
— | — | — | — | — | — | — |
| Equity and liabilities |
572 .0
GBP
|
— | — | — | — | — | — | — | — | — |
514 .0
GBP
|
— | — | — | — | — | — | — |