Value Added Tax returns for the quarter ended 31 May 2015 are due to be submitted by 7 July, and any payment which is due should be made electronically by the same date.
If you have been using a Retail Scheme for VAT, then an annual adjustment may be necessary. The use of Retail Schemes is rare.
If you have difficulties with paying VAT because other people still owe you money and are taking their time to pay you, then some advice on debt collection may be found at