Martyn, Danny and Chris used just one bike. They only used one set of wheels too
The wheels didn't suffer any damage at all, Continental tyres and tubes
they couldn't use the Shimano levers, as Dura Ace doesn't support hydraulic disk brakes. So they went with a separate brake levers and put the Di2 secondary/Time Trail controls on the handle bars
how they made the bike:
Road Bike Party 2 - The Making Of Martyn Ashton's Colnago C59 Disc - YouTube
just few notes from comments below the video:
more here:
http://www.chainreactionhub.com/latest-news/1186-bike-check-colnago-c59-disc-road-bike-from-the-road-bike-party-2-video