For £13k one would at least expect Campag...
In this much, at least, we can agree.
But £13k for this exotic and beautiful beastie is perfectly reasonable IMO. The components are only going to be a small percentage of the value of something like this. The reason it's so expensive is not because of the wholesale price of titanium, carbon or even the groupset or the wheels.
This bike is eye-wateringly expensive because it's taken the manufacturer the best part of a decade to develop it and they're the only company who make a machine to this specification. It's a low-volume, premium bit of kit and they're charging a price based on the R&D and the specialist manufacturing processes that they've developed.
You can easily spend £4-5k on a high end solo race bike model that gets turned out by the thousand, so why not £12k on a tandem with a frame number sequence that only gets up to the hundreds? This is the Zonda Roadster of the tandem world, costing the same as a Ford Focus. If I had a spare eight grand, it would be hanging from the rafters of the
SEEKRIT BUNKER quicker than The Stig inna Lamborghini Gallardo
Superleggera...