Statement Of Financial Position [Abstract]
| Concept |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
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 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 | — | — | — | — |
80. 5
GBP
|
— | — | — | — | — | — | — |
59. 3
GBP
|
— | — | — | — | — | — |
| Right-of-use assets | — | — | — | — |
32 .4
GBP
|
— | — | — | — | — | — | — |
31 .4
GBP
|
— | — | — | — | — | — |
| Trade and other non-current receivables | — | — | — | — |
1,300,000
GBP
|
— | — | — | — | — | — | — |
0. 5
GBP
|
— | — | — | — | — | — |
| Deferred tax assets | — | — | — | — |
13,700,000
GBP
|
— | — | — | — | — | — | — |
12,500,000
GBP
|
— | — | — | — | — | — |
| Non-current assets | — | — | — | — |
282 .1
GBP
|
— | — | — | — | — | — | — |
262. 6
GBP
|
— | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||
| Current inventories | — | — | — | — |
108 .4
GBP
|
— | — | — | — | — | — | — |
81 .4
GBP
|
— | — | — | — | — | — |
| Trade and other current receivables | — | — | — | — |
114. 7
GBP
|
— | — | — | — | — | — | — |
113. 2
GBP
|
— | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — |
9 7. 8
GBP
|
— | — | — | — | — | — | — |
1 12.7
GBP
|
— | — | — | — | — | — |
| Current assets | — | — | — | — |
324. 2
GBP
|
— | — | — | — | — | — | — |
309,400,000
GBP
|
— | — | — | — | — | — |
| Assets | — | — | — | — |
606 .3
GBP
|
— | — | — | — | — | — | — |
572,000,000
GBP
|
— | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||
| Issued capital | — | — | — | — |
2,900,000
GBP
|
— | — | — | — | — | — | — |
2,900,000
GBP
|
— | — | — | — | — | — |
| Retained earnings | — | — | — | — |
292 .6
GBP
|
— | — | — | — | — | — | — |
265 .4
GBP
|
— | — | — | — | — | — |
| Share premium | — | — | — | — |
62 .6
GBP
|
— | — | — | — | — | — | — |
62. 6
GBP
|
— | — | — | — | — | — |
| Other reserves | — | — | — | — |
0. 2
GBP
|
— | — | — | — | — | — | — |
200,000
GBP
|
— | — | — | — | — | — |
| Equity |
0. 2
GBP
|
292 .6
GBP
|
62 .6
GBP
|
2,900,000
GBP
|
365,700,000
GBP
|
7. 4
GBP
|
3 44.0
GBP
|
62 .6
GBP
|
2,900,000
GBP
|
265,400,000
GBP
|
12 .9
GBP
|
0. 2
GBP
|
3 4 4.0
GBP
|
24 3 . 2
GBP
|
0. 2
GBP
|
316 .4
GBP
|
2,900,000
GBP
|
62. 5
GBP
|
7. 6
GBP
|
| Liabilities [abstract] | |||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||
| Deferred tax liabilities | — | — | — | — |
12 .9
GBP
|
— | — | — | — | — | — | — |
7. 8
GBP
|
— | — | — | — | — | — |
| Non-current liabilities | — | — | — | — |
42 .4
GBP
|
— | — | — | — | — | — | — |
34,900,000
GBP
|
— | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||
| Current provisions [abstract] | |||||||||||||||||||
| Current provisions | — | — | — | — |
6,400,000
GBP
|
— | — | — | — | — | — | — |
7. 6
GBP
|
— | — | — | — | — | — |
| Trade and other current payables | — | — | — | — |
166 . 2
GBP
|
— | — | — | — | — | — | — |
1 59.4
GBP
|
— | — | — | — | — | — |
| Current liabilities | — | — | — | — |
198. 2
GBP
|
— | — | — | — | — | — | — |
193 .1
GBP
|
— | — | — | — | — | — |
| Liabilities | — | — | — | — |
24 0.6
GBP
|
— | — | — | — | — | — | — |
2 28.0
GBP
|
— | — | — | — | — | — |
| Equity and liabilities | — | — | — | — |
606. 3
GBP
|
— | — | — | — | — | — | — |
572,000,000
GBP
|
— | — | — | — | — | — |