Statement Of Financial Position [Abstract]
| Concept |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment |
9 9.0
GBP
|
— | — | — | — | — |
9 0.4
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method |
0. 3
GBP
|
— | — | — | — | — |
2,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables |
600,000
GBP
|
— | — | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
9 .7
GBP
|
— | — | — | — | — |
7. 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
4 69.7
GBP
|
— | — | — | — | — |
378. 3
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Current inventories |
2, 920.7
GBP
|
— | — | — | — | — |
2, 90 1. 3
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables |
123 .9
GBP
|
— | — | — | — | — |
8 6.6
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
1 , 24 6 .6
GBP
|
— | — | — | — | — |
1 , 23 4 .1
GBP
|
— | — | — | — | — | — | — | — |
8 43.9
GBP
|
— | — |
| Current assets |
4, 322. 5
GBP
|
— | — | — | — | — |
4, 24 4 . 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Assets |
4,792 . 2
GBP
|
— | — | — | — | — |
4, 623 .1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital |
31,900,000
GBP
|
— | — | — | — | — |
31 .9
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
3 , 0 55 .1
GBP
|
— | — | — | — | — |
2,950,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium |
24. 9
GBP
|
— | — | — | — | — |
22. 3
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
3,625. 2
GBP
|
3 , 0 55 .1
GBP
|
23 6.5
GBP
|
276. 8
GBP
|
24 . 9
GBP
|
31,900,000
GBP
|
3 , 51 8 .4
GBP
|
31,900,000
GBP
|
2 ,950. 9
GBP
|
236,500,000
GBP
|
22 .3
GBP
|
276 .8
GBP
|
2, 693. 9
GBP
|
236,500,000
GBP
|
276 . 8
GBP
|
3 , 258 . 3
GBP
|
1 9.2
GBP
|
3 1.9
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Trade and other non-current payables |
203,400,000
GBP
|
— | — | — | — | — |
179. 3
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
54 .6
GBP
|
— | — | — | — | — |
22,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
281,800,000
GBP
|
— | — | — | — | — |
230,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||
| Current provisions |
7 2 .7
GBP
|
— | — | — | — | — |
75 .0
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
8 0 7. 0
GBP
|
— | — | — | — | — |
79 4. 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
885,200,000
GBP
|
— | — | — | — | — |
8 74 . 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
1 ,1 6 7. 0
GBP
|
— | — | — | — | — |
1,1 0 4 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |