With the launch of the 2017 CAADX models the 2016 variants seem to be dropping in price. This one is around £650-750 elsewhere (in stock) so for £599.99 this seems a good deal. Original RRP is around £800 and reviews of the 2014 model suggest this makes a great cross/commuter bicycle. http://www.cyclingweekly.co.uk/reviews/cyclo-cross-bikes/cannondale-caadx-tiagra-cyclo-cross-bike
Evans cycles were happy to price match this, as I wanted to be able to take the bicycle into store if need be.
First deal - so if something doesn't work, apologies!