Analysis Of Income And Expense [Abstract]
| Concept |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
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 |
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 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||||||||
| Revenue [abstract] | ||||||||||||||||||||||||
| Revenue | — |
–
GBP
|
1,852,800,000
GBP
|
— | — | — | — | — | — | — | — |
1,852,800,000
GBP
|
— | — | — | — | — | — | — | — |
1,525,300,000
GBP
|
1,525,300,000
GBP
|
–
GBP
|
— |
| Miscellaneous other comprehensive income [abstract] | ||||||||||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations | — | — | — | — | — | — | — | — | — | — | — |
45,100,000
GBP
|
— | — | — | — | — | — | — | — |
43,900,000
GBP
|
— | — | — |
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||||||||||||||||
| Share of profit (loss) of associates and joint ventures accounted for using equity method | — |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
100,000
GBP
|
100,000
GBP
|
–
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 | — | — | — | — | — | — | — | — | — | — | — |
1,200,000
GBP
|
— | — | — | — | — | — | — | — |
9,600,000
GBP
|
— | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||||||||
| Comprehensive income |
–
GBP
|
— | — |
–
GBP
|
45,200,000
GBP
|
–
GBP
|
300,000
GBP
|
–
GBP
|
226,900,000
GBP
|
1,000,000
GBP
|
6,100,000
GBP
|
278,900,000
GBP
|
–
GBP
|
–
GBP
|
200,000
GBP
|
43,900,000
GBP
|
276,400,000
GBP
|
1,700,000
GBP
|
–
GBP
|
1,100,000
GBP
|
317,300,000
GBP
|
— | — |
–
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — | — | — | — | — |
279,200,000
GBP
|
— | — | — | — | — | — | — | — |
317,500,000
GBP
|
— | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — |
0
GBP
|
— | — | — |