The default position is that you'll need to prepare a VAT return quarterly. The deadline for submitting the return and making payment is the 7th of the second month following the end of the VAT quarter (i.e. 7 July for the quarter ended 31 May).
When your registration was approved, you should have received a letter from HM Revenue & Customs headed 'Certificate of Registration for Value Added Tax'. This will show on it the period that the first VAT return should cover.
-- Edited by Robert Pearce on Friday 15th of June 2012 03:27:43 PM
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Pearce & Co - Chartered Accountant and Chartered Tax Adviser