Statement Of Cash Flows [Abstract]
| Concept |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
As at 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-04-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
As at 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||
| Profit (loss) |
–
GBP
|
490,000,000
GBP
|
2,000,000
GBP
|
–
GBP
|
— |
492,000,000
GBP
|
4 90
GBP
|
–
GBP
|
3 96
GBP
|
397,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
396,000,000
GBP
|
–
GBP
|
1,000,000
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||
| Adjustments for decrease (increase) in inventories | — | — | — | — | — |
10,000,000
GBP
|
— | — | — | — | — |
22,000,000
GBP
|
— | — | — | — | — |
| Adjustments for share-based payments | — | — | — | — | — |
19,000,000
GBP
|
— | — | — | — | — |
16,000,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) operations | — | — | — | — | — |
912,000,000
GBP
|
— | — | — | — | — |
909,000,000
GBP
|
— | — | — | — | — |
| Interest paid, classified as operating activities | — | — | — | — | — |
40,000,000
GBP
|
— | — | — | — | — |
32,000,000
GBP
|
— | — | — | — | — |
| Interest received, classified as operating activities | — | — | — | — | — |
18,000,000
GBP
|
— | — | — | — | — |
2,000,000
GBP
|
— | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — |
140,000,000
GBP
|
— | — | — | — | — |
18 0
GBP
|
— | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — | — | — |
750,000,000
GBP
|
— | — | — | — | — |
699,000,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — | — | — |
–
GBP
|
— | — | — | — | — |
7,000,000
GBP
|
— | — | — | — | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — | — | — |
32,000,000
GBP
|
— | — | — | — | — |
8,000,000
GBP
|
— | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — |
136,000,000
GBP
|
— | — | — | — | — |
124,000,000
GBP
|
— | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — | — | — |
43,000,000
GBP
|
— | — | — | — | — |
37,000,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — |
147,000,000
GBP
|
— | — | — | — | — |
164,000,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||
| Proceeds from issuing shares | — | — | — | — | — |
3,000,000
GBP
|
— | — | — | — | — |
4,000,000
GBP
|
— | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — |
210,000,000
GBP
|
— | — | — | — | — |
202,000,000
GBP
|
— | — | — | — | — |
| Dividends paid, classified as financing activities | — | — | — | — | — |
203,000,000
GBP
|
— | — | — | — | — |
21 9
GBP
|
— | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — |
821,000,000
GBP
|
— | — | — | — | — |
58 1
GBP
|
— | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — | — |
218,000,000
GBP
|
— | — | — | — | — |
4 6
GBP
|
— | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — | — |
2,000,000
GBP
|
— | — | — | — | — |
7,000,000
GBP
|
— | — | — | — | — |
| Cash and cash equivalents | — | — | — | — |
1,026,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,222,000,000
GBP
|
— | — | — |