Statement Of Cash Flows [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 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 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 |
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 |
2020-04-01 to 2021-03-31 |
As at 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||||||||
| Profit (loss) |
164,200,000
GBP
|
–
GBP
|
3,700,000
GBP
|
–
GBP
|
164,200,000
GBP
|
–
GBP
|
167,900,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
1,803,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,803,000,000
GBP
|
–
GBP
|
1,803,000,000
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||||||||
| Adjustments for income tax expense | — | — | — | — | — | — |
14,400,000
GBP
|
— | — | — | — | — | — | — |
8,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for finance costs | — | — | — | — | — | — |
80,400,000
GBP
|
— | — | — | — | — | — | — |
7 7.8
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for decrease (increase) in inventories | — | — | — | — | — | — |
10,600,000
GBP
|
— | — | — | — | — | — | — |
32,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for provisions | — | — | — | — | — | — |
30,900,000
GBP
|
— | — | — | — | — | — | — |
14,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for share-based payments | — | — | — | — | — | — |
5,500,000
GBP
|
— | — | — | — | — | — | — |
3,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) operations | — | — | — | — | — | — |
41,800,000
GBP
|
— | — | — | — | — | — | — |
475,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Interest paid, classified as operating activities | — | — | — | — | — | — |
54,900,000
GBP
|
— | — | — | — | — | — | — |
79,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Interest received, classified as operating activities | — | — | — | — | — | — |
9,900,000
GBP
|
— | — | — | — | — | — | — |
12,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — | — |
10,000,000
GBP
|
— | — | — | — | — | — | — |
19,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — | — | — | — |
6,800,000
GBP
|
— | — | — | — | — | — | — |
427,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — | — | — | — | — | — |
420,700,000
GBP
|
— | — | — | — | — | — | — |
90,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — | — | — | — |
15,500,000
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
| Other cash payments to acquire interests in joint ventures, classified as investing activities | — | — | — | — | — | — |
2,600,000
GBP
|
— | — | — | — | — | — | — |
8,800,000
GBP
|
— | — | — | — | — | — | — | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — | — | — | — |
68,000,000
GBP
|
— | — | — | — | — | — | — |
33,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — | — |
190,800,000
GBP
|
— | — | — | — | — | — | — |
156,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — | — | — | — |
12,400,000
GBP
|
— | — | — | — | — | — | — |
19,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash advances and loans made to other parties, classified as investing activities | — | — | — | — | — | — |
1,400,000
GBP
|
— | — | — | — | — | — | — |
3,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities | — | — | — | — | — | — |
31,000,000
GBP
|
— | — | — | — | — | — | — |
4,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Dividends received, classified as investing activities | — | — | — | — | — | — |
41,600,000
GBP
|
— | — | — | — | — | — | — |
36,800,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — | — |
338,600,000
GBP
|
— | — | — | — | — | — | — |
2 4.4
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||||
| Payments to acquire or redeem entity's shares | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — |
2,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Proceeds from borrowings, classified as financing activities | — | — | — | — | — | — |
23,100,000
GBP
|
— | — | — | — | — | — | — |
25,100,000
GBP
|
— | — | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — | — | — | — |
31,700,000
GBP
|
— | — | — | — | — | — | — |
1,154,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — | — |
1 13.0
GBP
|
— | — | — | — | — | — | — |
140,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — | — |
122,700,000
GBP
|
— | — | — | — | — | — | — |
1,223 .9
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — | — | — |
222,700,000
GBP
|
— | — | — | — | — | — | — |
820,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — | — | — |
2,900,000
GBP
|
— | — | — | — | — | — | — |
3,100,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — | — |
1,146,300,000
GBP
|
— | — | — |
904,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1,845,900,000
GBP
|