It looks a bit like a rabbit hutch spider, which is a false widow type a quite common, my monies still on a European cave spider, m. Menardi, and that's a much better find IMO
The hype is actually complete b*****ks, the false widow spiders in the uk are venemous but only to the extent that it's like a bee or wasp sting, I think the only positive Id'd bites that have caused hospitalisation have been from allergies or other underlying health issues
Oh and remember, be nice, put her back where you found her when your finished
