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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Non-current assets [abstract] | |||||||||||||||
| Property, plant and equipment | — | — | — |
1,000,000
GBP
|
— |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — |
6,100,000
GBP
|
— |
7,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Goodwill | — | — | — |
24,700,000
GBP
|
— |
24,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — |
5,000,000
GBP
|
— |
2,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — |
300,000
GBP
|
— |
1,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — |
37,100,000
GBP
|
— |
37,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Trade and other current receivables | — | — | — |
5,600,000
GBP
|
— |
8,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
21,800,000
GBP
|
— |
18,700,000
GBP
|
— | — | — | — | — |
23,100,000
GBP
|
— | — | — |
| Current assets | — | — | — |
38,000,000
GBP
|
— |
39,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Assets | — | — | — |
75,100,000
GBP
|
— |
76,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital | — | — | — |
300,000
GBP
|
— |
300,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — |
50,200,000
GBP
|
— |
48,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Treasury shares | — | — | — |
8 .7
GBP
|
— |
7. 5
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity |
300,000
GBP
|
200,000
GBP
|
50,200,000
GBP
|
42,000,000
GBP
|
8 .7
GBP
|
42,000,000
GBP
|
7. 5
GBP
|
300,000
GBP
|
400,000
GBP
|
48,800,000
GBP
|
3,400,000
GBP
|
43,400,000
GBP
|
46,500,000
GBP
|
–
GBP
|
300,000
GBP
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||
| Non-current provisions | — | — | — |
700,000
GBP
|
— |
900,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — |
7,500,000
GBP
|
— |
8,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Current liabilities | — | — | — |
25,600,000
GBP
|
— |
25,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
33,100,000
GBP
|
— |
34,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — |
75,100,000
GBP
|
— |
76,500,000
GBP
|
— | — | — | — | — | — | — | — | — |