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] | ||||||||||||||||||||||||
| 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
|
— | — | — | — | — | — | — | — | — | — | — |
| 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
|
253,208,000
GBP
|
132,833,000
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] | ||||||||||||||||||||||||
| Deferred tax liabilities |
24,141,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
42,647,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
176,818,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
184,185,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |