Analysis Of Income And Expense [Abstract]
| Concept |
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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||||
| Revenue [abstract] | ||||||||||||||||||||
| Revenue | — | — | — |
4,390,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,438,600,000
GBP
|
| Material income and expense [abstract] | ||||||||||||||||||||
| Gains (losses) on disposals of investments [abstract] | ||||||||||||||||||||
| Gains (losses) on disposals of investments | — | — | — |
3,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
77,400,000
GBP
|
| Operating expense | — | — | — |
4,145,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,315,700,000
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 | — | — | — |
13,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
500,000
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 | — | — | — |
9,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,300,000
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 | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,700,000
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 | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,200,000
GBP
|
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||||
| Comprehensive income |
2,300,000
GBP
|
–
GBP
|
39,100,000
GBP
|
40,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
49,000,000
GBP
|
1,300,000
GBP
|
12,200,000
GBP
|
–
GBP
|
337,300,000
GBP
|
–
GBP
|
1,000,000
GBP
|
300,000
GBP
|
–
GBP
|
336,600,000
GBP
|
–
GBP
|
300,000
GBP
|
337,600,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — |
39,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
337,300,000
GBP
|
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — | — |
1,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
300,000
GBP
|