Statement Of Financial Position [Abstract]
| Concept |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment | — | — | — |
3,800,000
GBP
|
— | — | — | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — |
| Right-of-use assets | — | — | — |
18,100,000
GBP
|
— | — | — | — | — | — | — |
700,000
GBP
|
— | — | — | — | — | — |
| Investment property | — | — | — |
939,000,000
GBP
|
— | — | — | — | — | — | — |
608,700,000
GBP
|
— | — | — | — | — | — |
| Goodwill | — | — | — |
3,600,000
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — |
900,000
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — |
| Non-current assets | — | — | — |
970,700,000
GBP
|
— | — | — | — | — | — | — |
615,400,000
GBP
|
— | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Trade and other current receivables | — | — | — |
22,100,000
GBP
|
— | — | — | — | — | — | — |
11,400,000
GBP
|
— | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
61,300,000
GBP
|
— | — | — | — | — | — | — |
132,800,000
GBP
|
— |
108,600,000
GBP
|
— | — | — | — |
| Current assets | — | — | — |
83,400,000
GBP
|
— | — | — | — | — | — | — |
144,200,000
GBP
|
— | — | — | — | — | — |
| Assets | — | — | — |
1,054,100,000
GBP
|
— | — | — | — | — | — | — |
759,600,000
GBP
|
— | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital | — | — | — |
4,700,000
GBP
|
— | — | — | — | — | — | — |
3,100,000
GBP
|
— | — | — | — | — | — |
| Share premium | — | — | — |
53,900,000
GBP
|
— | — | — | — | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — |
| Treasury shares | — | — | — |
1,400,000
GBP
|
— | — | — | — | — | — | — |
3,000,000
GBP
|
— | — | — | — | — | — |
| Equity |
4,700,000
GBP
|
358,600,000
GBP
|
74,300,000
GBP
|
490,100,000
GBP
|
53,900,000
GBP
|
1,400,000
GBP
|
2,300,000
GBP
|
359,300,000
GBP
|
4,000,000
GBP
|
3,100,000
GBP
|
3,000,000
GBP
|
361,100,000
GBP
|
2,300,000
GBP
|
378,600,000
GBP
|
2,400,000
GBP
|
3,100,000
GBP
|
–
GBP
|
375,400,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities | — | — | — |
508,800,000
GBP
|
— | — | — | — | — | — | — |
371,800,000
GBP
|
— | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Trade and other current payables | — | — | — |
53,400,000
GBP
|
— | — | — | — | — | — | — |
26,300,000
GBP
|
— | — | — | — | — | — |
| Current liabilities | — | — | — |
55,200,000
GBP
|
— | — | — | — | — | — | — |
26,700,000
GBP
|
— | — | — | — | — | — |