Chap at my local airfield has a Mk26, I believe it was bought from Aus and shipped to the UK where he flew it on its Aus reg for a while and was able to fly aeros in it. As soon as it got transferred onto the LAA he had to stop, crazy eh, same aircraft, same airspace just different paperwork.....
Have the same issue with my own aircraft where its fully aerobatic everywhere in the world other than the UK!
Regards
UA