I used an online estate agent a couple of years and sold my house within a month. It was advertised on all the main property web sites where all the other estate agents list as well. If you're willing to do a bit of the work yourself ie show people round your house, then you can save thousands. The one I used had various levels of payment, either all up front or part up front and part on completion. Their fee was a few hundred pounds instead of a few thousand. Great value and great service.