I was chatting to a bloke in the pub last week who leads trips like this. He has recently returned from escorting a group around the world... and they had paid an awful lot of money for the privilege.
He has taken a look at his prospects for the next year or so and has decided to offer trips around the UK to American motorcyclists. This decision has been based partly on the weakness of the pound. Nice to know that our economy makes us a cheaper option than touring Morocco

GC