Statement Of Financial Position [Abstract]
| Concept |
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 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 |
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 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||
| Property, plant and equipment |
600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
681,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
254,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
94,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Investment property |
400,363,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
478,355,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables |
4,013,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
5,369,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
435,058,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
520,630,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||
| Current inventories |
216,393,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
177,822,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables |
56,658,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
49,755,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets |
344,424,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
241,539,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Assets |
779,482,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
762,169,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Issued capital |
32,305,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
32,272,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium |
24,688,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
24,627,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Treasury shares |
50,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
24,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
602,664,000
GBP
|
174,520,000
GBP
|
24,688,000
GBP
|
257,000
GBP
|
325,277,000
GBP
|
50,000
GBP
|
32,305,000
GBP
|
45,667,000
GBP
|
24,000
GBP
|
275,556,000
GBP
|
257,000
GBP
|
199,629,000
GBP
|
577,984,000
GBP
|
45,667,000
GBP
|
24,627,000
GBP
|
32,272,000
GBP
|
132,833,000
GBP
|
253,208,000
GBP
|
32,253,000
GBP
|
45,667,000
GBP
|
73,000
GBP
|
24,567,000
GBP
|
488,712,000
GBP
|
257,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||
| Trade and other non-current payables |
2,819,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
5,686,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
24,141,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
42,647,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
84,157,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
86,880,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||
| Trade and other current payables |
82,499,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
94,316,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current tax liabilities, current |
7,013,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,947,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
92,661,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
97,305,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
176,818,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
184,185,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |