Check out Ubitex! There's a link in my signature, it's pretty much perfect for this sort of thing.
I've looked at Ubitex a few times, if it had a better login system then I would probably give it a go.
Edit: Alternatively, if the site gave me an opportunity to see if there are any listings / people in my city / country without logging in, I might make the effort and go find an openid url.
I'm interested - based nr West London. Do you have any contact details I can get ahold of you on?
PM sent.