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 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 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 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||
| Property, plant and equipment |
39,000,000
GBP
|
— | — | — | — | — | — | — | — |
49,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
55,200,000
GBP
|
— | — | — | — | — | — | — | — |
73. 5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
1. 8
GBP
|
— | — | — | — | — | — | — | — |
4 .1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
6 03 .1
GBP
|
— | — | — | — | — | — | — | — |
9 4 9 .1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1, 2 90 . 9
GBP
|
— | — | — | — | — |
| Assets |
1 ,022.0
GBP
|
— | — | — | — | — | — | — | — |
1, 3 5 3 . 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital |
8 .1
GBP
|
— | — | — | — | — | — | — | — |
9,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
9 0 7. 5
GBP
|
— | — | — | — | — | — | — | — |
604 .5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares |
51. 5
GBP
|
— | — | — | — | — | — | — | — |
6 6.0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
1. 2
GBP
|
— | — | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
508,800,000
GBP
|
9 0 7. 5
GBP
|
1. 2
GBP
|
—
GBP
|
8 .1
GBP
|
13 . 2
GBP
|
1, 2 8 8 . 5
GBP
|
51. 5
GBP
|
18 3 . 2
GBP
|
8 0 4 .1
GBP
|
—
GBP
|
—
GBP
|
18 3 .2
GBP
|
60 4.5
GBP
|
66 . 0
GBP
|
9,300,000
GBP
|
6 .4
GBP
|
1 ,2 88.5
GBP
|
—
GBP
|
1, 4 0 8 .7
GBP
|
—
GBP
|
1, 0 7 3 .7
GBP
|
1 ,288.5
GBP
|
1 ,01 3.0
GBP
|
18 3 .2
GBP
|
11 . 6
GBP
|
9,300,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Liabilities |
5 13 . 2
GBP
|
— | — | — | — | — | — | — | — |
549,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |