At the moment only the RV-4 is cleared for aerobatics in the UK. Unlike in the US, we have to have clearance by the authorities, even for Permit aircraft.
Tailplane spar structural tests are being prepared over here for the 6/7/8 and then it'll rely on satisfactory flight tests, including spin recovery which hopefully won't be a problem.
Originally Van's were going to carry out the tailplane tests but they changed their mind as they hadn't got time.....
Fortunately the PFA are going beyond their required remit and trying to help us RV people go beyond the straight and level.