Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-03-31 |
As at 2021-03-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
10,208,400,000
GBP
|
9,875,200,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
179,600,000
GBP
|
164,000,000
GBP
|
| Goodwill |
91,400,000
GBP
|
91,400,000
GBP
|
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||
| Investments in joint ventures reported in separate financial statements |
16,500,000
GBP
|
–
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Trade and other non-current receivables |
92,100,000
GBP
|
101,500,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
17,500,000
GBP
|
17,100,000
GBP
|
| Non-current derivative financial assets |
31,200,000
GBP
|
37,100,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
606,400,000
GBP
|
515,200,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
32,000,000
GBP
|
30,800,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash [abstract] | ||
| Balances with banks |
40,400,000
GBP
|
56,200,000
GBP
|
| Cash equivalents [abstract] | ||
| Short-term deposits, classified as cash equivalents |
75,000,000
GBP
|
–
GBP
|
| Cash and cash equivalents |
115,400,000
GBP
|
56,200,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
27,600,000
GBP
|
3,800,000
GBP
|
| Borrowings [abstract] | ||
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
365,200,000
GBP
|
503,100,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Non-current portion of other non-current borrowings |
6,365,900,000
GBP
|
6,112,800,000
GBP
|
| Trade and other non-current payables [abstract] | ||
| Trade and other non-current payables |
1,334,000,000
GBP
|
1,250,300,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
655,500,000
GBP
|
557,100,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
145,500,000
GBP
|
384,800,000
GBP
|
| Non-current derivative financial liabilities |
43,300,000
GBP
|
126,900,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
248,100,000
GBP
|
237,200,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
473,000,000
GBP
|
651,700,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets (liabilities) |
1,263,900,000
GBP
|
1,138,700,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
787,600,000
GBP
|
606,000,000
GBP
|
| Current liabilities |
1,059,100,000
GBP
|
1,078,400,000
GBP
|
| Current assets (liabilities) |
271,500,000
GBP
|
472,400,000
GBP
|
| Assets less current liabilities [abstract] | ||
| Assets less current liabilities |
10,495,100,000
GBP
|
9,944,700,000
GBP
|