When the new system starts
From 4 April 2011 to 30 June 2011, both the previous B2/AS1 (amendment 6) and the new B2/AS1 (amendment 7) can be used as an Acceptable Solution for consenting purposes.
From 1 July 2011 onwards, only the new B2/AS1 can be used as an Acceptable Solution.
Know the new system - and frame it right first time.