Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2025-03-31 |
As at 2024-03-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
13,873,000,000
GBP
|
13,044,300,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets and goodwill |
105,800,000
GBP
|
124,500,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Trade and other non-current receivables |
73,600,000
GBP
|
73,700,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
302,300,000
GBP
|
268,000,000
GBP
|
| Non-current derivative financial assets |
329,300,000
GBP
|
361,500,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
282,000,000
GBP
|
226,800,000
GBP
|
| Classes of current inventories [abstract] | ||
| Property intended for sale in ordinary course of business |
2,700,000
GBP
|
3,000,000
GBP
|
| Other current inventories |
21,900,000
GBP
|
18,500,000
GBP
|
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
1,672,600,000
GBP
|
1,399,300,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
11,400,000
GBP
|
21,300,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
10,326,500,000
GBP
|
9,345,800,000
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
462,100,000
GBP
|
655,600,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other non-current payables [abstract] | ||
| Trade and other non-current payables |
1,063,800,000
GBP
|
957,900,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
577,200,000
GBP
|
413,300,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current derivative financial liabilities |
275,000,000
GBP
|
255,200,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
17,600,000
GBP
|
25,400,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
499,800,000
GBP
|
499,800,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
1,178,000,000
GBP
|
1,242,300,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
16,769,500,000
GBP
|
15,653,400,000
GBP
|
| Liabilities |
14,769,600,000
GBP
|
13,597,300,000
GBP
|
| Assets (liabilities) |
1,999,900,000
GBP
|
2,056,100,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
2,083,900,000
GBP
|
1,769,000,000
GBP
|
| Current liabilities |
1,075,900,000
GBP
|
1,107,800,000
GBP
|
| Assets less current liabilities [abstract] |