Statement Of Financial Position [Abstract]
| Concept |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment | — |
1,262,386,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,430,513,000
GBP
|
— | — | — | — | — | — | — |
| Right-of-use assets | — |
298,032,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
349,925,000
GBP
|
— | — | — | — | — | — | — |
| Goodwill | — |
1,716,684,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,190,147,000
GBP
|
— | — | — | — | — | — | — |
| Intangible assets other than goodwill | — |
696,819,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
946,798,000
GBP
|
— | — | — | — | — | — | — |
| Investments accounted for using equity method | — |
71,428,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
32,825,000
GBP
|
— | — | — | — | — | — | — |
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners | — |
1,070,864,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Deferred tax assets | — |
87,446,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
81,258,000
GBP
|
— | — | — | — | — | — | — |
| Cash and cash equivalents | — |
1,088,175,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,109,446,000
GBP
|
— | — | — | — | — | — | — |
| Assets | — |
9,257,629,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
9,483,219,000
GBP
|
— | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital | — |
17,422,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
17,422,000
GBP
|
— | — | — | — | — | — | — |
| Retained earnings | — |
2,087,407,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,078,568,000
GBP
|
— | — | — | — | — | — | — |
| Share premium | — |
883,909,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
883,890,000
GBP
|
— | — | — | — | — | — | — |
| Other reserves | — |
932,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
932,000
GBP
|
— | — | — | — | — | — | — |
| Equity attributable to owners of parent | — |
3,073,427,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
3,091,391,000
GBP
|
— | — | — | — | — | — | — |
| Non-controlling interests | — |
94,869,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
91,641,000
GBP
|
— | — | — | — | — | — | — |
| Equity |
84,689,000
GBP
|
3,168,296,000
GBP
|
94,869,000
GBP
|
883,909,000
GBP
|
17,422,000
GBP
|
2,087,407,000
GBP
|
3,073,427,000
GBP
|
111,511,000
GBP
|
3,091,391,000
GBP
|
2,078,568,000
GBP
|
91,641,000
GBP
|
883,890,000
GBP
|
17,422,000
GBP
|
3,183,032,000
GBP
|
2,978,091,000
GBP
|
3,058,310,000
GBP
|
883,669,000
GBP
|
17,422,000
GBP
|
80,219,000
GBP
|
1,941,223,000
GBP
|
135,777,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||
| Current tax liabilities | — |
73,781,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
81,095,000
GBP
|
— | — | — | — | — | — | — |
| Deferred tax liabilities | — |
223,949,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
286,217,000
GBP
|
— | — | — | — | — | — | — |
| Liabilities included in disposal groups classified as held for sale | — |
262,925,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Liabilities | — |
6,089,333,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
6,300,187,000
GBP
|
— | — | — | — | — | — | — |
| Equity and liabilities | — |
9,257,629,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
9,483,219,000
GBP
|
— | — | — | — | — | — | — |