Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 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 changes in equity [abstract] | |||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||
| Equity | — | — |
42,000,000
GBP
|
50,200,000
GBP
|
— | — | — |
300,000
GBP
|
200,000
GBP
|
8 .7
GBP
|
42,000,000
GBP
|
— | — | — | — |
48,800,000
GBP
|
7. 5
GBP
|
300,000
GBP
|
400,000
GBP
|
— |
3,400,000
GBP
|
46,500,000
GBP
|
43,400,000
GBP
|
–
GBP
|
300,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
23,500,000
GBP
|
— | — |
23,500,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
24,500,000
GBP
|
24,500,000
GBP
|
— | — | — | — |
–
GBP
|
— | — | — | — | — |
| Other comprehensive income |
–
GBP
|
0. 2
GBP
|
— | — |
–
GBP
|
0 . 2
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
400,000
GBP
|
–
GBP
|
— | — | — | — |
400,000
GBP
|
— | — | — | — | — |
| Comprehensive income |
–
GBP
|
23,300,000
GBP
|
— | — |
23,500,000
GBP
|
0 . 2
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
24,900,000
GBP
|
24,500,000
GBP
|
— | — | — | — |
400,000
GBP
|
— | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
19 . 7
GBP
|
— | — |
19 . 7
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
22,500,000
GBP
|
2 2.5
GBP
|
— | — | — | — |
–
GBP
|
— | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
1,500,000
GBP
|
— | — |
1,500,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
1,500,000
GBP
|
1,500,000
GBP
|
— | — | — | — |
–
GBP
|
— | — | — | — | — |