Analysis Of Income And Expense [Abstract]
| Concept |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||
| Revenue [abstract] | ||||||||||
| Revenue | — | — | — | — |
1,862,700,000
GBP
|
— | — | — | — |
1,808,000,000
GBP
|
| Material income and expense [abstract] | ||||||||||
| Investment income | — | — | — | — |
19,400,000
GBP
|
— | — | — | — |
25,000,000
GBP
|
| Operating expense | — | — | — | — |
1,252,700,000
GBP
|
— | — | — | — |
1,205,900,000
GBP
|
| Expenses by nature [abstract] | ||||||||||
| Classes of employee benefits expense [abstract] | ||||||||||
| Employee benefits expense | — | — | — | — |
184,300,000
GBP
|
— | — | — | — |
173,400,000
GBP
|
| Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract] | ||||||||||
| Depreciation and amortisation expense [abstract] | ||||||||||
| Depreciation and amortisation expense | — | — | — | — |
418,200,000
GBP
|
— | — | — | — |
422,300,000
GBP
|
| Other expenses, by nature | — | — | — | — |
461,700,000
GBP
|
— | — | — | — |
420,300,000
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 | — | — | — | — |
1,800,000
GBP
|
— | — | — | — |
9,300,000
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 | — | — | — | — |
109,400,000
GBP
|
— | — | — | — |
36,600,000
GBP
|
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — | — | — |
26,800,000
GBP
|
— | — | — | — |
1,800,000
GBP
|
| Income tax relating to components of other comprehensive income |
–
GBP
|
109,400,000
GBP
|
26,800,000
GBP
|
–
GBP
|
136,200,000
GBP
|
600,000
GBP
|
–
GBP
|
–
GBP
|
34,200,000
GBP
|
34,800,000
GBP
|
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||
| Comprehensive income |
–
GBP
|
143,300,000
GBP
|
79,900,000
GBP
|
–
GBP
|
223,200,000
GBP
|
400,000
GBP
|
–
GBP
|
–
GBP
|
361,600,000
GBP
|
361,200,000
GBP
|