Or use several local agents to give you a rough idea on price?
Am personally aware of several sales done without any agent involved other than providing valuations.
If a property has a buyer out there, they will be found via the likes of Right Move in my experience. Most people when looking...
Why don't you try using the private selling route or something like Purple Bricks. Get a few free valuations then market it via the usual channels eg Right Move. If it sells all well and good with minimal cost. If you don't swing your bat, you can't score any runs.