I beg to differ. I'm a CAA design signatory, and am used to getting them to approve such things.
No it won't be automatic, you can't just fill in a form and ask a DER to look over it in the manner that goes on in the USA. But it's not impossible, just difficult.
Of-course, if you run a PFA or BMAA permit aircraft, it's all much less agro, you just have to convince the relevant Chief Engineer that it'll be safe....
G