The current standard rate of VAT is 20% as of 4th January 2011.
Any sales of standard-rated goods or services that you make on or after 4 January 2011 you must charge VAT at 20 per cent rate. If you have a cash business and calculate your VAT using the VAT fraction you must use the VAT fraction of 1/6 on your standard-rated VAT inclusive sales from 4 January 2011.
The change only applies to the standard VAT rate. There are no changes to sales that are zero-rated or reduced-rated for VAT. Similarly, there are no changes to the VAT exemptions. Any sales you make at these rates are unaffected by this change.