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Trouble is with Rose and Canyon, whilst they make great frames and offer a good package, they're not good for a first road bike as you can't try them out before you buy. I tend to avoid the big brands like Specialized, Giant and Trek in favour of something a bit different but the fact is that those big brands are available everywhere so you can easily get a test ride. Most of us here know exactly how long they want their effective top tube (I even know how tall I want the head tube!), but a first time buyer needs to experiment.
@Ollie this bike has a famously good frame, good components, looks dead cool, unlimited upgrade potential and you can easily get a test ride at your nearest Evans Cycles. Would also leave you a bit left in the budget to put towards some new wheels in the future.
http://www.evanscycles.com/products/cannondale/caad10-2015-road-bike-ec071008?country=GB¤cy=GBP&esvt=894-GOUKE245604&esvadt=999999-0-33002-1&esvcrea=61232578616&esvd=m&esvo=EV214031-50-TEAM&esvaid=50080&gclid=CMbiuJ2eh8YCFTLLtAodiQwAOw
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I agree with @SamuelD, for a first road bike it would be best to test ride them. The CAAD10 or the Synapse would both be great choices.
Good options, also check out the Rose bikes. Similar ilk to the Canyons. I think the XEON Carbon is around £1500