Even a stopped clock is right twice.I was up in Halfords yesterday trying a few on.
It may well be sacrilege but I'm now veering towards a hybrid. The Halfords fella was pretty useless in giving advice (such gems as "it's up to you" and "whatever you feel most comfortable with") but I did feel the hybrid gave me a more comfortable position. As a 50+ this is likely to be mightily important!
I'm back home and contemplating
You were right about the price of the one I pm'd you about .... you need to scroll down a bit when it opens
http://www.ebay.co.uk/itm/CANNONDALE-SYNAPSE-CARBON-fibre-105-TRIPLE-ROAD-BIKE-56cm-/281363468691?nma=true&si=lrVd2gVT1elmbBxtlidF39BuT7c%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
My local Halfords has the bike I linked from £499 reduced to £399 in chrome.
It looks the business, is very well specced, and will be pretty rapid.
If you have £300 ish burning a hole in you're pocket, finding the extra £99 is a considerably better option than 'dumbing down' to a £250 Carerra or Real or whatever other generic brand they stock.
All that assumes you are actually comfortable and happy with the Boardman.
If you just don't like it, don't buy it on my say so.
You won't ride it if you're hearts not in it.