As an overseas seller I contacted the only agent I knew - Foxtons. I gave them an exclusive mandate for 8 months only to get 8 months of excuses as to why they couldn't sell the place. I then gave it to another agent who came back with 3 offers and sold the place within a few months. Meanwhile all I continued to get from Foxtons was excuses and a stream of PR emails about all the meaningless awards they claim to win! On top of all that they hopelessly over valued the place to start with. Useless agent!
I would advise prospective sellers to avoid wasting their time with Foxtons, there are plenty of hungrier agents out there who will get the job done quicker and more professionally.