Statement Of Financial Position [Abstract]
| Concept |
As at 2022-03-31 |
As at 2022-03-26 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2021-03-26 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||||
| Property, plant and equipment |
10 2 .7
GBP
|
— | — | — |
10 0 . 0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
12 . 9
GBP
|
— | — | — |
14 . 6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
11. 2
GBP
|
— | — | — |
19 . 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other non-current financial assets |
7. 4
GBP
|
— | — | — |
8,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
20 3.4
GBP
|
— | — | — |
175 . 5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||||
| Current inventories |
5 0 .1
GBP
|
— | — | — |
5 4.5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables |
89,000,000
GBP
|
— | — | — |
98,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
24,300,000
GBP
|
24,300,000
GBP
|
— | — |
25 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
14 . 5
GBP
|
— | — | — | — | — | — | — |
| Current assets |
17 5 .1
GBP
|
— | — | — |
2 0 1. 6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
378. 5
GBP
|
— | — | — |
3 7 7.1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||||
| Issued capital |
8 8.8
GBP
|
— | — | — |
88,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
3 5 .1
GBP
|
— | — | — |
14 . 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
42 .2
GBP
|
— | — | — |
42. 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
31. 9
GBP
|
— | — | — |
3 1. 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
14 3. 8
GBP
|
— | — | — |
9 5.0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
18 .0
GBP
|
— | — | — |
16. 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
1 61. 8
GBP
|
— |
31. 9
GBP
|
14 . 9
GBP
|
111 . 4
GBP
|
88,800,000
GBP
|
42 . 2
GBP
|
5 .7
GBP
|
0. 8
GBP
|
5,900,000
GBP
|
16. 4
GBP
|
161. 8
GBP
|
88,800,000
GBP
|
3 5 .1
GBP
|
42. 2
GBP
|
500,000
GBP
|
4. 2
GBP
|
3 1. 9
GBP
|
18 . 0
GBP
|
5,900,000
GBP
|
42. 2
GBP
|
9 3.2
GBP
|
0 .1
GBP
|
4 7. 8
GBP
|
8 3.8
GBP
|
15 . 2
GBP
|
9,600,000
GBP
|
56,200,000
GBP
|
5,900,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||||
| Deferred tax liabilities |
2 .4
GBP
|
— | — | — |
2. 6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
10 9 . 4
GBP
|
— | — | — |
111,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||||
| Current provisions [abstract] | |||||||||||||||||||||||||||||
| Current provisions |
5,900,000
GBP
|
— | — | — |
9,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
80,000,000
GBP
|
— | — | — |
1 20.5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
1 0 7. 3
GBP
|
— | — | — |
15 4. 6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
216 .7
GBP
|
— | — | — |
26 5.7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |