Wouldnt have to, but we were largely responsible for the beginnings of the ECHR... we won't be leaving as that would be rather non-conservative, also being the only non member in Europe (even Russia is a member), would look downright silly. (Should note that Poland is currently not a member, and i don't know why)
Sure, that's a different debate.
But i just said an off the cuff remark which i seem to have been hounded for regarding why we have trouble deporting some of the extreme guys.