Bought recently as is in photo. Carbon fork, Carbon rear stay Bonded. Found plastic Seda covered the Ribble name. No serial no. Campagnolo chorus bottom Bracket. I cant find the model of this bike.
Think this was a Ribble Scandium frame with the Deda carbon rear seat stays. The earlier version was all scandium aluminium possibly. Link below shows a smaller version of yours. Might be worth emailing Ribble to see if they know the model and year?
