Statement Of Financial Position [Abstract]
| Concept |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Non-current assets [abstract] | |||||||||||||||
| Property, plant and equipment | — | — | — |
95,100,000
GBP
|
— | — | — | — |
86,000,000
GBP
|
— | — | — | — | — | — |
| Investment property | — | — | — |
600,000
GBP
|
— | — | — | — |
800,000
GBP
|
— | — | — | — | — | — |
| Non-current assets | — | — | — |
425,700,000
GBP
|
— | — | — | — |
412,000,000
GBP
|
— | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Current inventories | — | — | — |
476,000,000
GBP
|
— | — | — | — |
344,700,000
GBP
|
— | — | — | — | — | — |
| Trade and other current receivables | — | — | — |
453,500,000
GBP
|
— | — | — | — |
461,600,000
GBP
|
— | — | — | — | — | — |
| Current tax assets, current | — | — | — |
6,600,000
GBP
|
— | — | — | — |
–
GBP
|
— | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
544,200,000
GBP
|
— | — | — | — |
541,300,000
GBP
|
— | — | — | — | — | — |
| Current assets | — | — | — |
1,704,900,000
GBP
|
— | — | — | — |
1,618,200,000
GBP
|
— | — | — | — | — | — |
| Assets | — | — | — |
2,130,600,000
GBP
|
— | — | — | — |
2,030,200,000
GBP
|
— | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital | — | — | — |
2,400,000
GBP
|
— | — | — | — |
2,400,000
GBP
|
— | — | — | — | — | — |
| Retained earnings | — | — | — |
578,200,000
GBP
|
— | — | — | — |
508,400,000
GBP
|
— | — | — | — | — | — |
| Share premium | — | — | — |
65,700,000
GBP
|
— | — | — | — |
56,000,000
GBP
|
— | — | — | — | — | — |
| Other reserves | — | — | — |
900,000
GBP
|
— | — | — | — |
1,300,000
GBP
|
— | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — |
647,200,000
GBP
|
— | — | — | — |
568,100,000
GBP
|
— | — | — | — | — | — |
| Equity |
578,200,000
GBP
|
65,700,000
GBP
|
900,000
GBP
|
647,200,000
GBP
|
2,400,000
GBP
|
56,000,000
GBP
|
2,400,000
GBP
|
508,400,000
GBP
|
568,100,000
GBP
|
1,300,000
GBP
|
496,200,000
GBP
|
55,900,000
GBP
|
2,400,000
GBP
|
436,800,000
GBP
|
1,100,000
GBP
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||
| Non-current provisions | — | — | — |
20,400,000
GBP
|
— | — | — | — |
19,400,000
GBP
|
— | — | — | — | — | — |
| Trade and other non-current payables | — | — | — |
16,600,000
GBP
|
— | — | — | — |
28,200,000
GBP
|
— | — | — | — | — | — |
| Deferred tax liabilities | — | — | — |
2,100,000
GBP
|
— | — | — | — |
8,700,000
GBP
|
— | — | — | — | — | — |
| Non-current liabilities | — | — | — |
83,200,000
GBP
|
— | — | — | — |
101,000,000
GBP
|
— | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Current provisions [abstract] | |||||||||||||||
| Current provisions | — | — | — |
85,100,000
GBP
|
— | — | — | — |
76,700,000
GBP
|
— | — | — | — | — | — |
| Trade and other current payables | — | — | — |
1,130,300,000
GBP
|
— | — | — | — |
1,087,000,000
GBP
|
— | — | — | — | — | — |
| Current tax liabilities, current | — | — | — |
–
GBP
|
— | — | — | — |
1,900,000
GBP
|
— | — | — | — | — | — |
| Current liabilities | — | — | — |
1,400,200,000
GBP
|
— | — | — | — |
1,361,100,000
GBP
|
— | — | — | — | — | — |
| Liabilities | — | — | — |
1,483,400,000
GBP
|
— | — | — | — |
1,462,100,000
GBP
|
— | — | — | — | — | — |