Statement Of Financial Position [Abstract]
| Concept |
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 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment |
800,000
GBP
|
— | — | — | — | — | — |
900,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
14,400,000
GBP
|
— | — | — | — | — | — |
14,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Goodwill |
24,700,000
GBP
|
— | — | — | — | — | — |
24,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
1,800,000
GBP
|
— | — | — | — | — | — |
1,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Non-current assets |
44,400,000
GBP
|
— | — | — | — | — | — |
44,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Cash and cash equivalents |
23,100,000
GBP
|
— | — | — | — | — | — |
37,000,000
GBP
|
— | — | — | — | — | — |
58,800,000
GBP
|
— | — | — |
| Current assets |
39,600,000
GBP
|
— | — | — | — | — | — |
50,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Assets |
84,000,000
GBP
|
— | — | — | — | — | — |
95,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital |
300,000
GBP
|
— | — | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Retained earnings |
46,500,000
GBP
|
— | — | — | — | — | — |
59,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity |
43,400,000
GBP
|
46,500,000
GBP
|
3,400,000
GBP
|
43,400,000
GBP
|
–
GBP
|
300,000
GBP
|
60,200,000
GBP
|
60,200,000
GBP
|
300,000
GBP
|
59,800,000
GBP
|
100,000
GBP
|
–
GBP
|
82,300,000
GBP
|
82,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
300,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||
| Other non-current provisions |
1,400,000
GBP
|
— | — | — | — | — | — |
1,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
16,600,000
GBP
|
— | — | — | — | — | — |
17,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Trade and other current payables |
9,300,000
GBP
|
— | — | — | — | — | — |
8,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current tax liabilities, current |
1,800,000
GBP
|
— | — | — | — | — | — |
1,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current liabilities |
24,000,000
GBP
|
— | — | — | — | — | — |
18,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Liabilities |
40,600,000
GBP
|
— | — | — | — | — | — |
35,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
84,000,000
GBP
|
— | — | — | — | — | — |
95,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |