The UK list is a bit grim at the moment, mainly because you are mixing cities and counties into the same list. That comes across as strange, almost as if you are making a category error. Have you though of sticking to counties, or using sythentic regions (The South East, The Northwest, the Midlands etc).
Also, we are aggregating other sites such as cars.com on the us site and other local classifieds data, so it's easier to find stuff in one place.
But definitely that where the challenge lies.
Bug: When clicking the logo to return to the home page from one of the UK regional urls the site returns to the .com instead of .co.uk page and shows the US locations.