pre_text: The tax credit/(charge) for the period differs from the standard rate of corporation tax in the United Kingdom of 19.0% (2017/18: 19.0%). The reasons for this are explained below: The movements in losses recognised for the period ended 30 March 2019 is £nil (2017/18: £1.1m). Corporation tax losses are not recognised where future recoverability is uncertain. The adjustments to prior periods of £1.7m (2017/18: £(8.1m)) relate mainly to the adjustment of prior period losses and capital allowances which have been revised following submission of tax returns.
table: 52 weeks ended 30 Mar 2019 £m 52 weeks ended 31 Mar 2018 £m
table: (Loss)/profit before taxation (42.7) 20.9
table: Tax credit/(charge) at the domestic income tax rate of 19.0% (2017/18: 19.0%) 8.2 (4.0)
table: Tax effect of:
table: Non-deductible items (0.9) (0.1)
table: Other disallowable items - (0.4)
table: Impairment of goodwill - (0.8)
table: Adjustment for share-based payments (0.4) (0.6)
table: Adjustment due to current period deferred tax being provided at 17.0% (2017/18: 17.0%) (0.8) 0.7
table: Movements in losses recognised - 1.1
table: Adjustment to restate opening deferred tax at 17.0% (2017/18: 17.0%) - (2.3)
table: Adjustments to prior periods 1.7 (8.1)
table: Current tax relating to overseas business 1.1 0.8
table: Income tax credit/(charge) 8.9 (13.7)
question: Analyse this data from a financial earnings document. What was the change in the (Loss)/profit before taxation from 2018 to 2019?