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 | — | — | — |
800,000
GBP
|
— |
1 .1
GBP
|
— | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — |
1,200,000
GBP
|
— |
1. 3
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — |
1,08 0.8
GBP
|
— |
1,070,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Trade and other current receivables | — | — | — |
6,500,000
GBP
|
— |
7. 0
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
40,500,000
GBP
|
— |
55,800,000
GBP
|
— | — | — | — | — |
3 7. 1
GBP
|
— | — | — |
| Current assets | — | — | — |
69,500,000
GBP
|
— |
76 .5
GBP
|
— | — | — | — | — | — | — | — | — |
| Assets | — | — | — |
1, 150.3
GBP
|
— |
1,1 4 6 . 5
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital | — | — | — |
6 .0
GBP
|
— |
6 .0
GBP
|
— | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — |
303. 8
GBP
|
— |
249. 8
GBP
|
— | — | — | — | — | — | — | — | — |
| Share premium | — | — | — |
0. 3
GBP
|
— |
0. 3
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity |
0. 3
GBP
|
6,000,000
GBP
|
303. 8
GBP
|
734. 2
GBP
|
42 4 .1
GBP
|
70 0.8
GBP
|
0. 3
GBP
|
249. 8
GBP
|
6,000,000
GBP
|
444. 7
GBP
|
4 59.9
GBP
|
6 4 7. 6
GBP
|
181,400,000
GBP
|
0. 3
GBP
|
6,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current liabilities | — | — | — |
301 .2
GBP
|
— |
3 8 7. 7
GBP
|
— | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Trade and other current payables | — | — | — |
23,400,000
GBP
|
— |
24 . 8
GBP
|
— | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — |
114 .9
GBP
|
— |
58,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
41 6 .1
GBP
|
— |
4 4 5 .7
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — |
1,150,300,000
GBP
|
— |
1 ,14 6 . 5
GBP
|
— | — | — | — | — | — | — | — | — |