Well I gone and done it and ordered a Scott CR1 Pro (HMF) framset so super excited and should have it built up in time for the ride london :-).
I am swapping over my 105 groupset and Fulcrum racing 5 wheels. I am now contemplating which seatpost, stem and handlebars to go for. So far thinking of
Easton EA90 Road/MTB Oversized Stem 2010
100mm (-10 deg) Black £47.99
Easton EC70 SL Road Handlebar
42cm x 31.8mm Black £89.99
Ritchey SuperLogic Carbon Seat Post (1-Bolt )
300mm x 31.6mm Carbon £153.98
£291 is more than I want to pay for those three items so any other suggestion on good quality light alternatives would be welcome.