I recently bought a Road Bike from Gumtree....... had to travel 2hrs to collect it, but glad I did.
£325 got me a fantastic Trek 1.7, in simply immaculate condition, barely used, despite being 4yrs old at least.
For someone like me, who wanted to try Road Biking, it was well worth it. That said, I'm already drooling at lots of expensive alternatives,
including a Canyon CF SLX :-)