Jon.
I sold my old commencal frame and couried that, found a company that were quite cheap but they were pretty crap and said they called at my work and no-one was there which was complete crap as its 24 hour reception, Ill go read my emails and find the name, it did get to its destination ok but hardly great service.
On the other side, my new Commencal cost 14 Euros P&P to come all the way from Andorra and was a great service with really detailed tracking so I could watch its journey
I found that when sending my frame there is a certain weight that when it goes over (as a full bike maybe) it suddenly goes up a lot in price.
Andy