Statement Of Financial Position [Abstract]
| Concept |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Property, plant and equipment | — | — |
21,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
22,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current tax assets | — | — |
6,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
7,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — |
113,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
113,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — |
7,679,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
6,056,300,000
GBP
|
— | — | — | — | — |
3,358,600,000
GBP
|
— | — | — | — |
| Assets | — | — |
11,904,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
7,564,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Issued capital | — | — |
10,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
10,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — |
357,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
224,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — |
23,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
17,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity |
247,400,000
GBP
|
10,400,000
GBP
|
576,900,000
GBP
|
10,200,000
GBP
|
357,800,000
GBP
|
8,000,000
GBP
|
3,200,000
GBP
|
23. 3
GBP
|
400,000
GBP
|
8,000,000
GBP
|
10,200,000
GBP
|
200,000
GBP
|
224,500,000
GBP
|
409,200,000
GBP
|
200,500,000
GBP
|
17,800,000
GBP
|
124,500,000
GBP
|
8,000,000
GBP
|
162,600,000
GBP
|
285,300,000
GBP
|
700,000
GBP
|
9,400,000
GBP
|
–
GBP
|
2,500,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||
| Current tax liabilities | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
5,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — | — |
1,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — |
11,327,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
7,155,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — |
11,904,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
7,564,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |