I got mine last April and the garage put a years MOT on it with the HFC's on(with an advisory of exhaust noisy lol!). I'm keeping my fingers crossed that it passes again next month at my local garage. Worse case scenario is that I do still have the original cats so it will just mean a bit of pratting about swapping them over I guess.
I have to admit that the noise the car makes is my favourite thing about it, and I didn't want a standard one because they are too quiet for me(I used to have a TVR Cerbera 4.5 so I like/enjoy exhausts loud! ).