Statement Of Cash Flows [Abstract]
| Concept |
2021-03-28 to 2022-04-02 |
2021-03-28 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 |
2021-03-28 to 2022-04-02 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
As at 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||
| Profit (loss) |
397,000,000
GBP
|
–
GBP
|
–
GBP
|
— |
396,000,000
GBP
|
396,000,000
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
— |
376,000,000
GBP
|
–
GBP
|
–
GBP
|
376,000,000
GBP
|
376,000,000
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||
| Adjustments for decrease (increase) in inventories |
22,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
21,000,000
GBP
|
— | — | — | — |
| Adjustments for share-based payments |
16,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
12,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) operations |
909,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
677,000,000
GBP
|
— | — | — | — |
| Interest paid, classified as operating activities |
32,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
30,000,000
GBP
|
— | — | — | — |
| Interest received, classified as operating activities |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
3,000,000
GBP
|
— | — | — | — |
| Income taxes paid (refund), classified as operating activities |
180,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
58,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) operating activities |
699,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
592,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |
7,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities |
8,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
27,000,000
GBP
|
— | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities |
124,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
73,000,000
GBP
|
— | — | — | — |
| Purchase of intangible assets, classified as investing activities |
37,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
42,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) investing activities |
164,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
91,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— | — | — | — |
| Proceeds from issuing shares |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— | — | — | — |
| Proceeds from borrowings, classified as financing activities |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
595,000,000
GBP
|
— | — | — | — |
| Repayments of borrowings, classified as financing activities |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
600,000,000
GBP
|
— | — | — | — |
| Payments of lease liabilities, classified as financing activities |
202,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1 51
GBP
|
— | — | — | — |
| Dividends paid, classified as financing activities |
219,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — |
| Cash flows from (used in) financing activities |
581,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1 59
GBP
|
— | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
46,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
342,000,000
GBP
|
— | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents |
7,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
13,000,000
GBP
|
— | — | — | — |
| Cash and cash equivalents | — | — | — |
1,222,000,000
GBP
|
— | — | — | — | — | — |
1,261,000,000
GBP
|
— | — | — | — | — |