SO this is the bike that I think I'm going to plum for. A Canyon Inflite 8.0 S, a winter training version of the full on cyclo-cross models brought out by Canyon Bikes in 2013. www.canyon.com
I had a long chat with Andy Panks, the extremely knowledgeable and experienced engineer at Specialised Cyles on Connaught Road in Norwich. His advice and comments were positive about Canyon bikes generally and specifically that for the money, you'd be hard pushed to build something similar for half as much again as this retails at. Useful advice indeed.
That said, I do want to make some adjustments and would welcome any experienced users of hub dynamos and lighting systems and or tri-bars for long distance riding.