Statement Of Financial Position [Abstract]
| Concept |
As at 2023-06-30 |
As at 2023-06-30 |
As at 2023-06-30 |
As at 2023-06-30 |
As at 2022-06-30 |
As at 2022-06-30 |
As at 2022-06-30 |
As at 2022-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
As at 2021-06-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||
| Assets [abstract] | ||||||||||||
| Property, plant and equipment | — |
2,800,000
GBP
|
— | — | — | — |
2,700,000
GBP
|
— | — | — | — | — |
| Intangible assets other than goodwill | — |
19,900,000
GBP
|
— | — | — | — |
13,400,000
GBP
|
— | — | — | — | — |
| Cash and cash equivalents | — |
52,200,000
GBP
|
— | — | — | — |
58,900,000
GBP
|
— | — |
56,700,000
GBP
|
— | — |
| Assets | — |
1,318,600,000
GBP
|
— | — | — | — |
1,311,200,000
GBP
|
— | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||
| Equity [abstract] | ||||||||||||
| Issued capital | — |
68,800,000
GBP
|
— | — | — | — |
68,800,000
GBP
|
— | — | — | — | — |
| Retained earnings | — |
1,500,000
GBP
|
— | — | — | — |
1,700,000
GBP
|
— | — | — | — | — |
| Other reserves | — |
48,500,000
GBP
|
— | — | — | — |
48,300,000
GBP
|
— | — | — | — | — |
| Equity |
48,500,000
GBP
|
21,800,000
GBP
|
1,500,000
GBP
|
68,800,000
GBP
|
48,300,000
GBP
|
1,700,000
GBP
|
22,200,000
GBP
|
68,800,000
GBP
|
68,800,000
GBP
|
24,700,000
GBP
|
4,200,000
GBP
|
48,300,000
GBP
|
| Liabilities [abstract] | ||||||||||||
| Provisions [abstract] | ||||||||||||
| Provisions | — |
100,000
GBP
|
— | — | — | — |
200,000
GBP
|
— | — | — | — | — |
| Liabilities | — |
1,296,800,000
GBP
|
— | — | — | — |
1,289,000,000
GBP
|
— | — | — | — | — |