Analysis Of Income And Expense [Abstract]
| Concept |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||
| Revenue [abstract] | ||||||||||
| Revenue | — | — |
2,145,200,000
GBP
|
— | — | — | — |
1,949,500,000
GBP
|
— | — |
| Material income and expense [abstract] | ||||||||||
| Investment income | — | — |
106,200,000
GBP
|
— | — | — | — |
85,600,000
GBP
|
— | — |
| Operating expense | — | — |
1,513,700,000
GBP
|
— | — | — | — |
1,469,300,000
GBP
|
— | — |
| Expenses by nature [abstract] | ||||||||||
| Classes of employee benefits expense [abstract] | ||||||||||
| Employee benefits expense | — | — |
224,100,000
GBP
|
— | — | — | — |
205,100,000
GBP
|
— | — |
| Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract] | ||||||||||
| Depreciation and amortisation expense [abstract] | ||||||||||
| Amortisation expense | — | — |
29,200,000
GBP
|
— | — | — | — |
32,700,000
GBP
|
— | — |
| Other expenses, by nature | — | — |
630,600,000
GBP
|
— | — | — | — |
602,400,000
GBP
|
— | — |
| Disclosure of attribution of expenses by nature to their function [text block] | — | — | — | — | — | — | — | — | — | — |
| Disclosure of attribution of expenses by nature to their function [abstract] | ||||||||||
| Disclosure of attribution of expenses by nature to their function [line items] | ||||||||||
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||
| Share of profit (loss) of joint ventures accounted for using equity method | — | — |
10,800,000
GBP
|
— | — | — | — |
4,100,000
GBP
|
— | — |
| Income tax relating to components of other comprehensive income [abstract] | ||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — |
6,000,000
GBP
|
— | — | — | — |
151,100,000
GBP
|
— | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss |
–
GBP
|
–
GBP
|
300,000
GBP
|
300,000
GBP
|
–
GBP
|
500,000
GBP
|
–
GBP
|
500,000
GBP
|
–
GBP
|
–
GBP
|
| Income tax relating to components of other comprehensive income |
–
GBP
|
–
GBP
|
8,200,000
GBP
|
3,100,000
GBP
|
5,100,000
GBP
|
14,600,000
GBP
|
152,300,000
GBP
|
166,900,000
GBP
|
–
GBP
|
–
GBP
|
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||
| Comprehensive income |
–
GBP
|
–
GBP
|
288,200,000
GBP
|
8,100,000
GBP
|
280,100,000
GBP
|
42,300,000
GBP
|
88,600,000
GBP
|
130,900,000
GBP
|
–
GBP
|
–
GBP
|