Well, for anyone interested my update is as follows:
Don't ever go in person to J E James in Rotherham. They give bike shops a bad name
They are really helpful
They have loads and loads of stock, its a positive cornucopia of cool stuff
They build up your wheels while you wait
They're cyclists
They give discount
They give discount then go and look on the website to see if there are any web only offers they can give you as well!
Did I say they're really helpful?
and you end up spending way more than you plan!
I am now the poor but proud owner of a set of Mavic Cosmic SRs
Just need to get them down from parents house in Yorkshire (they wouldn't fit in my car)