I have mentioned earlier that Craigslist id definitely no.1 classifieds website in US and Canada but Craigslist UK is good only in London
Below are some sites in the UK where you can use as alternatives for Craigslist to reach local people in the Uk:
http://gumtree.com/
http://tapthat.co.uk/
http://hallolondon.co.uk/
http://london.adzooks.co.uk/
http://vivastreet.co.uk/
http://adoos.co.uk/
http://freeukclassifieds.co.uk/
http://admart.co.uk/
http://www.loot.com/
http://uk.freeads.net/
http://www.adoos.co.uk/
http://www.friday-ad.co.uk/