pre_text: The net contract acquisition expense deferred within the Consolidated Statement of Profit or Loss was $0.9M of the total $259.9M of Sales and Marketing costs (2018: $8.4M / $239.9M). At 31 March 2019, trade receivables at a nominal value of $1.2M (2018: $0.9M) were impaired and fully provided for. Movements in the provision for impairment of receivables were as follows: 31
table: 31 March 2019 31 March 2018
table: $M $M
table: At 1 April 0.9 0.4
table: Charge for the year 0.6 0.6
table: Amounts written off (0.2) (0.1)
table: Effects of movements in exchange rates (0.1) –
table: At 31 March 1.2 0.9
question: Analyse this data from a financial earnings document. What was the change in the value at 31 March in 2019 from 2018?