Statement Of Financial Position [Abstract]
| Concept |
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 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | — |
38 . 3
GBP
|
— | — | — | — |
32. 6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — | — | — | — |
105 . 5
GBP
|
— | — | — | — |
7 7. 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — | — | — |
9. 6
GBP
|
— | — | — | — |
7. 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — | — | — |
415 . 5
GBP
|
— | — | — | — |
3 7 7. 0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||
| Current inventories | — | — | — | — | — | — |
123. 0
GBP
|
— | — | — | — |
1 01 . 5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables | — | — | — | — | — | — |
85 . 6
GBP
|
— | — | — | — |
5 9. 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — |
228,000,000
GBP
|
— | — | — | — |
11 3. 6
GBP
|
— | — | — | — | — | — | — |
117 .2
GBP
|
— | — | — | — |
| Current assets | — | — | — | — | — | — |
44 3 .6
GBP
|
— | — | — | — |
2 74 . 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — | — |
8 59. 1
GBP
|
— | — | — | — |
65 1. 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Issued capital | — | — | — | — | — | — |
10. 0
GBP
|
— | — | — | — |
10 .0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — |
1 ,7 1 1 . 3
GBP
|
— | — | — | — |
1 , 5 37. 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares | — | — | — | — | — | — |
–
GBP
|
— | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
–
GBP
|
1,400. 0
GBP
|
100,000
GBP
|
1 0.0
GBP
|
7. 0
GBP
|
1 ,7 1 1 . 3
GBP
|
328 . 2
GBP
|
–
GBP
|
–
GBP
|
1,400. 0
GBP
|
–
GBP
|
1 4 9.7
GBP
|
1 , 5 3 7. 1
GBP
|
10. 0
GBP
|
2 .7
GBP
|
100,000
GBP
|
–
GBP
|
–
GBP
|
1 0.1
GBP
|
70 . 5
GBP
|
16 5. 8
GBP
|
1 . 5
GBP
|
–
GBP
|
22 4 .7
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||
| Non-current provisions | — | — | — | — | — | — |
1 .9
GBP
|
— | — | — | — |
1 . 6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — | — | — | — |
375 .9
GBP
|
— | — | — | — |
3 49. 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||
| Trade and other current payables | — | — | — | — | — | — |
134,700,000
GBP
|
— | — | — | — |
133,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — | — | — | — |
155,000,000
GBP
|
— | — | — | — |
152,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — | — |
5 3 0.9
GBP
|
— | — | — | — |
502,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |