Those pistols you are after are all section 7 ticket in GB and bound to be quite rare ( therefore expensive and complicated paperwork) . I don't know any shooters who retained such low quality stuff on ticket so you will struggle to get most centrefires or any .22rf of the types you are after

You might be better looking for pinfires, quite common and reasonably cheap over here , and I believe ammo (or at least, primed cases) are available on the continent.