Hi Spenny, no quibbling about the quality of the bike and the enclosed detail. It would help your sale if you stated the 'frame size'. Rather than go into a narrative on how to measure this, it might be quicker, next time you are passing by a bike shop to ask about this if you are not already aware.
Cheers for the heads up mate. I should have actually specified on the original post, that the first link takes you to the exact bike Im selling and also specifies the frame size. In this case its a 53cm carbon fibre monocoque frame.