Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2025-03-31 |
As at 2024-03-31 |
As at 2023-03-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
42,000,000
GBP
|
7,000,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
3,000,000
GBP
|
3,000,000
GBP
|
— |
| Investment property [abstract] | |||
| Investment property |
1 0,0 3 4
GBP
|
9, 3 3 0
GBP
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in subsidiaries reported in separate financial statements |
–
GBP
|
–
GBP
|
— |
| Investments in joint ventures reported in separate financial statements |
551,000,000
GBP
|
529,000,000
GBP
|
— |
| Investments in associates reported in separate financial statements |
–
GBP
|
–
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
229,000,000
GBP
|
1 59
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current finance lease receivables |
19,000,000
GBP
|
21,000,000
GBP
|
— |
| Other non-current assets |
22,000,000
GBP
|
41,000,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
4 67
GBP
|
37 9
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
81,000,000
GBP
|
10 0
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
39,000,000
GBP
|
78,000,000
GBP
|
41,000,000
GBP
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners |
110,000,000
GBP
|
–
GBP
|
— |
| Miscellaneous current assets [abstract] | |||
| Other current assets |
4,000,000
GBP
|
11,000,000
GBP
|
— |
| Miscellaneous assets [abstract] | |||
| Restricted cash and cash equivalents |
20,000,000
GBP
|
6,000,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
3,8 0 2
GBP
|
2,8 05
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
75 2
GBP
|
975,000,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other non-current payables [abstract] | |||
| Trade and other non-current payables |
4 4
GBP
|
4,000,000
GBP
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
4 0 6
GBP
|
3 4 8
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Other non-current liabilities |
5,000,000
GBP
|
1 3
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Other current liabilities |
6,000,000
GBP
|
–
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
80,000,000
GBP
|
80,000,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
6,0 8 5
GBP
|
5 ,9 8 0
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Merger reserve |
–
GBP
|
–
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
1 1 ,621
GBP
|
10,6 6 4
GBP
|
— |
| Liabilities |
5 ,0 89
GBP
|
4 , 21 7
GBP
|
— |
| Assets (liabilities) |
6,5 32
GBP
|
6, 4 47
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
721,000,000
GBP
|
5 74
GBP
|
— |
| Current liabilities |
1 ,2 0 8
GBP
|
1, 3 5 3
GBP
|
— |
| Assets less current liabilities [abstract] |