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 |
558,900,000
GBP
|
517,100,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
142,400,000
GBP
|
148,800,000
GBP
|
| Goodwill |
778. 2
GBP
|
780. 1
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
43,500,000
GBP
|
59,700,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Non-current receivables due from related parties |
3,600,000
GBP
|
3,900,000
GBP
|
| Trade and other non-current receivables |
18,100,000
GBP
|
13,000,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
98,800,000
GBP
|
107. 3
GBP
|
| Non-current derivative financial assets |
5,100,000
GBP
|
2,800,000
GBP
|
| Non-current finance lease receivables |
26,200,000
GBP
|
22,500,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
507,400,000
GBP
|
487,200,000
GBP
|
| Current prepayments and current accrued income including current contract assets [abstract] | ||
| Current accrued income including current contract assets [abstract] | ||
| Current contract assets |
329,700,000
GBP
|
260,900,000
GBP
|
| Categories of non-current financial assets [abstract] | ||
| Non-current financial assets |
4,200,000
GBP
|
5,300,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
162,200,000
GBP
|
187,400,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
646,600,000
GBP
|
570,600,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
9,300,000
GBP
|
4,400,000
GBP
|
| Current finance lease receivables |
18,400,000
GBP
|
13,000,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
750,700,000
GBP
|
74 7.1
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
600,000
GBP
|
20,400,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other non-current payables [abstract] | ||
| Trade and other non-current payables |
4,200,000
GBP
|
5,400,000
GBP
|
| Trade and other current payables [abstract] | ||
| Current accruals and current deferred income including current contract liabilities [abstract] | ||
| Current deferred income including current contract liabilities [abstract] | ||
| Current contract liabilities [abstract] | ||
| Current contract liabilities |
759,400,000
GBP
|
685,300,000
GBP
|
| Trade and other current payables |
948,000,000
GBP
|
949,200,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
107,200,000
GBP
|
217,000,000
GBP
|
| Non-current derivative financial liabilities |
44,800,000
GBP
|
51,900,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
9,100,000
GBP
|
9,500,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
303,400,000
GBP
|
303,400,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
1,292,300,000
GBP
|
1,523,900,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
3,690,200,000
GBP
|
3,503,600,000
GBP
|
| Liabilities |
3,068,400,000
GBP
|
3,097,500,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
1,679,600,000
GBP
|
1,535,200,000
GBP
|
| Current liabilities |
1,870,100,000
GBP
|
1,804,700,000
GBP
|
| Assets less current liabilities [abstract] |