| As at 2 July 2016 | | 2.0 | 1.6 | 43.2 | 5.9 | 46.9 | 99.6 |
| Profit for the period | | — | — | — | — | 73.1 | 73.1 |
| Fair value gains of cash flow hedges | 18 | — | — | — | 1.4 | — | 1.4 |
| Gains on cash flow hedges transferred to inventory | 18 | — | — | — | (9.4) | — | (9.4) |
| Deferred tax on hedging movements | 13 | — | — | — | 1.4 | — | 1.4 |
| Total comprehensive income for the period | | — | — | — | (6.6) | 73.1 | 66.5 |
| | | | | | | |
| Purchase of treasury shares | 22 | — | — | — | — | (4.2) | (4.2) |
| Proceeds from issue of treasury shares | 22 | — | — | — | — | 0.9 | 0.9 |
| Share-based payments | 23 | — | — | — | — | (0.3) | (0.3) |
| Deferred tax on share-based payments | 13 | — | — | — | — | (0.6) | (0.6) |
| Current tax on share options exercised | | — | — | — | — | (0.2) | (0.2) |
| Ordinary dividends paid | 9 | — | — | — | — | (51.6) | (51.6) |
| Total transactions with owners, recorded directly in equity | | — | — | — | — | (56.0) | (56.0) |
| As at 1 July 2017 | | 2.0 | 1.6 | 43.2 | (0.7) | 64.0 | 110.1 |
| Profit for the period | | — | — | — | — | 73.3 | 73.3 |
| Fair value gains of cash flow hedges | 18 | — | — | — | 1.6 | — | 1.6 |
| Loss on cash flow hedges transferred to inventory | 18 | — | — | — | 2.6 | — | 2.6 |
| Deferred tax on hedging movements | 13 | — | — | — | (0.7) | — | (0.7) |
| Total comprehensive income for the period | | — | — | — | 3.5 | 73.3 | 76.8 |
| | | | | | | |
| Proceeds from issue of treasury shares | 22 | — | — | — | — | 1.3 | 1.3 |
| Share-based payments | 23 | — | — | — | — | 0.3 | 0.3 |
| Deferred tax on share-based payments | 13 | — | — | — | — | (0.3) | (0.3) |
| Current tax on share options exercised | | — | — | — | — | (0.1) | (0.1) |
| Ordinary dividends paid | 9 | — | — | — | — | (53.4) | (53.4) |
| Total transactions with owners, recorded directly in equity | | — | — | — | — | (52.2) | (52.2) |
| As at 30 June 2018 | | 2.0 | 1.6 | 43.2 | 2.8 | 85.1 | 134.7 |