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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||
| Property, plant and equipment | — |
61 . 3
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
38 . 3
GBP
|
— | — | — | — | — | — | — | — | — |
| Right-of-use assets | — |
14 4 .1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1 05. 5
GBP
|
— | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — |
1 .0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Deferred tax assets | — |
11 .8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
9. 6
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current assets | — |
483,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
415. 5
GBP
|
— | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||
| Current inventories | — |
2 5 7. 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
12 3.0
GBP
|
— | — | — | — | — | — | — | — | — |
| Trade and other current receivables | — |
93 . 0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
85 .6
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — |
1 57. 5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2 28 .0
GBP
|
— | — | — | — | — |
113 .6
GBP
|
— | — | — |
| Current assets | — |
508,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
4 43 .6
GBP
|
— | — | — | — | — | — | — | — | — |
| Assets | — |
992 .6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
8 5 9. 1
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Issued capital | — |
10,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
10,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Retained earnings | — |
1 ,7 8 2 . 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,711,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Treasury shares | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity |
0 . 5
GBP
|
404,200,000
GBP
|
10,000,000
GBP
|
–
GBP
|
1 ,7 8 2 . 2
GBP
|
1,400. 0
GBP
|
12. 5
GBP
|
–
GBP
|
–
GBP
|
1,400 .0
GBP
|
100,000
GBP
|
10,000,000
GBP
|
7. 0
GBP
|
1 ,7 1 1 . 3
GBP
|
328 . 2
GBP
|
–
GBP
|
–
GBP
|
1,400. 0
GBP
|
–
GBP
|
1 , 5 3 7. 1
GBP
|
1 4 9.7
GBP
|
10,000,000
GBP
|
2 .7
GBP
|
100,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||
| Non-current provisions | — |
4 . 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1 .9
GBP
|
— | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — |
1 . 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current liabilities | — |
42 3 . 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
3 75 .9
GBP
|
— | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||
| Trade and other current payables | — |
127 . 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
133. 9
GBP
|
— | — | — | — | — | — | — | — | — |
| Current liabilities | — |
16 4 . 5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1 5 5 . 0
GBP
|
— | — | — | — | — | — | — | — | — |
| Liabilities | — |
58 8 . 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
530. 9
GBP
|
— | — | — | — | — | — | — | — | — |