Statement Of Financial Position [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
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 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment | — | — | — |
1 40.5
GBP
|
— | — |
1 1 8.6
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — | — | — |
1. 0
GBP
|
— | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables | — | — | — |
6,900,000
GBP
|
— | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — |
11 . 5
GBP
|
— | — |
1 0.5
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — |
47 9.6
GBP
|
— | — |
48 7 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Current inventories | — | — | — |
3,70 1 .2
GBP
|
— | — |
3,462,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables | — | — | — |
1 82.0
GBP
|
— | — |
1 93.2
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
420,100,000
GBP
|
— | — |
86 1 .6
GBP
|
— | — | — | — | — |
1 ,2 46.6
GBP
|
— | — | — | — | — |
| Current assets | — | — | — |
4,308,200,000
GBP
|
— | — |
4,546,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — |
4,7 87 .8
GBP
|
— | — |
5,03 4.1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital | — | — | — |
31 . 9
GBP
|
— | — |
31 . 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — |
2,847 .7
GBP
|
— | — |
2,868,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — |
25,600,000
GBP
|
— | — |
25,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
25,600,000
GBP
|
31 . 9
GBP
|
2,847 .7
GBP
|
3,4 1 8.5
GBP
|
236,500,000
GBP
|
27 6.8
GBP
|
3,439,300,000
GBP
|
25,600,000
GBP
|
2 36.5
GBP
|
2,868,500,000
GBP
|
31 . 9
GBP
|
2 7 6.8
GBP
|
3,6 25.2
GBP
|
236,500,000
GBP
|
3,055,100,000
GBP
|
2 7 6.8
GBP
|
2 4.9
GBP
|
31 . 9
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||
| Non-current provisions | — | — | — |
1 6 1 .7
GBP
|
— | — |
1 96.8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables | — | — | — |
1 78.7
GBP
|
— | — |
2 1 4.8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — | — | — |
64,900,000
GBP
|
— | — |
72,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — |
420,400,000
GBP
|
— | — |
503,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||
| Current provisions | — | — | — |
1 2 1 .5
GBP
|
— | — |
1 36.5
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables | — | — | — |
82 1 .7
GBP
|
— | — |
94 9.4
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — |
948,900,000
GBP
|
— | — |
1 ,09 1 .5
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
1 ,369.3
GBP
|
— | — |
1 ,59 4.8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |