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 |
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 | — | — | — | — | — | — | — | — | — |
4,438,600,000
GBP
|
— | — | — | — | — | — |
4,101,800,000
GBP
|
— | — | — |
| Material income and expense [abstract] | ||||||||||||||||||||
| Gains (losses) on disposals of investments [abstract] | ||||||||||||||||||||
| Gains (losses) on disposals of investments | — | — | — | — | — | — | — | — | — |
77,400,000
GBP
|
— | — | — | — | — | — |
172,800,000
GBP
|
— | — | — |
| Operating expense | — | — | — | — | — | — | — | — | — |
4,315,700,000
GBP
|
— | — | — | — | — | — |
4,040,600,000
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 | — | — | — | — | — | — | — | — | — |
500,000
GBP
|
— | — | — | — | — | — |
200,000
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 | — | — | — | — | — | — | — | — | — |
9,300,000
GBP
|
— | — | — | — | — | — |
20,100,000
GBP
|
— | — | — |
| Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax [abstract] | ||||||||||||||||||||
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | — | — | — | — | — | — | — | — | — |
4,700,000
GBP
|
— | — | — | — | — | — |
30,200,000
GBP
|
— | — | — |
| Income tax relating to share of other comprehensive income of associates and joint ventures accounted for using equity method [abstract] | ||||||||||||||||||||
| Income tax relating to share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss | — | — | — | — | — | — | — | — | — |
1,200,000
GBP
|
— | — | — | — | — | — |
5,700,000
GBP
|
— | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||||
| Comprehensive income |
–
GBP
|
337,300,000
GBP
|
–
GBP
|
1,000,000
GBP
|
300,000
GBP
|
–
GBP
|
300,000
GBP
|
–
GBP
|
336,600,000
GBP
|
337,600,000
GBP
|
461,200,000
GBP
|
–
GBP
|
4,600,000
GBP
|
8,000,000
GBP
|
422,500,000
GBP
|
–
GBP
|
465,800,000
GBP
|
–
GBP
|
46,700,000
GBP
|
–
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — | — | — |
337,300,000
GBP
|
— | — | — | — | — | — |
461,200,000
GBP
|
— | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — |
4,600,000
GBP
|
— | — | — |