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 2023-12-31 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2022-12-25 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
As at 2021-12-26 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment |
97,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
96,500,000
GBP
|
— | — | — | — | — | — | — | — |
| Right-of-use assets |
19,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
21,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Investments accounted for using equity method |
25,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
25,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Current tax assets |
3,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,700,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash and cash equivalents |
52,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
30,400,000
GBP
|
— | — | — | — |
42,800,000
GBP
|
— | — | — |
| Assets |
512,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
520,700,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital |
2,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Retained earnings |
171,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
156,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Share premium |
49,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
49,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity |
134,000,000
GBP
|
171,100,000
GBP
|
500,000
GBP
|
49,600,000
GBP
|
2,100,000
GBP
|
2,600,000
GBP
|
12,500,000
GBP
|
9,000,000
GBP
|
500,000
GBP
|
2,200,000
GBP
|
49,600,000
GBP
|
500,000
GBP
|
112,800,000
GBP
|
156,600,000
GBP
|
2,300,000
GBP
|
105,400,000
GBP
|
1,000,000
GBP
|
58,600,000
GBP
|
49,600,000
GBP
|
4,600,000
GBP
|
500,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||
| Other financial liabilities |
6,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
8,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Current tax liabilities |
2,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
| Liabilities |
646,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
633,500,000
GBP
|
— | — | — | — | — | — | — | — |