The CAA has introduced simpler requirements, known as E Conditions, for approving the initial flight testing of small experimental aircraft. The new requirements allow aircraft designers to try out a new concept aircraft up to a maximum take-off weight of 2,000kg in the air without going through the costly and time-consuming procedures that currently exist to get a new design past the initial prototype stage. E Conditions can also be used to test modifications. While there are still limitations this change should open up new possibilities for designers of aircraft.
CAA Relaxes Rules of Flight Testing Experimental Aircraft (Pilot Web)