In reply to Indy:
> £50?
> paulscycles.co.uk is doing a brand new 2013 caad8 for £350 so to be honest I can't see yours being much.
It's a 2300 model discounted at £350, we don't know what the OP has, it could easily be a Tiagra or 105 model.
If it is in reasonable condition and one of those two models, I would say £200-300. A bit less if it is a 2300.