Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
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 |
13,044,300,000
GBP
|
12,570,700,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets and goodwill |
124,500,000
GBP
|
142,300,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Trade and other non-current receivables |
73,700,000
GBP
|
75,700,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
268,000,000
GBP
|
600,800,000
GBP
|
| Non-current derivative financial assets |
361,500,000
GBP
|
428,600,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
226,800,000
GBP
|
190,500,000
GBP
|
| Classes of current inventories [abstract] | ||
| Property intended for sale in ordinary course of business |
3,000,000
GBP
|
4,200,000
GBP
|
| Other current inventories |
18,500,000
GBP
|
8,900,000
GBP
|
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
1,399,300,000
GBP
|
340,400,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
21,300,000
GBP
|
48,500,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
9,345,800,000
GBP
|
8,259,000,000
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
655,600,000
GBP
|
176,400,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other non-current payables [abstract] | ||
| Trade and other non-current payables |
957,900,000
GBP
|
892,400,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
413,300,000
GBP
|
376,700,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current derivative financial liabilities |
255,200,000
GBP
|
243,100,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
25,400,000
GBP
|
9,700,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
499,800,000
GBP
|
499,800,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
1,242,300,000
GBP
|
1,652,600,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
15,653,400,000
GBP
|
14,527,200,000
GBP
|
| Liabilities |
13,597,300,000
GBP
|
12,018,500,000
GBP
|
| Assets (liabilities) |
2,056,100,000
GBP
|
2,508,700,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
1,769,000,000
GBP
|
691,400,000
GBP
|
| Current liabilities |
1,107,800,000
GBP
|
575,900,000
GBP
|
| Assets less current liabilities [abstract] |