You've probably heard of Craig's List, the online version of the want ads; now England has it's own version called Gumtree! Gumtree is the place to go if you are looking for jobs in london. Looking through the job listings, they have a lengthy list of available jobs ranging from entry level positions to highly skilled and specialized positions.
If you are interested in things other than london jobs, they also have listings for other items that people have for sale. Items such as cars, furniture, electronic items, books, baby items, and the likes. Pretty much stuff that you would find in a yard sale. It looks like they also have a good number of listings for houses and apartments (flats) that are either for sale or rent. Their personal ads also look pretty extensive. So if you're in the UK, and I think I have several readers from there, this might be a bookmark worthy site to refer to in the future.