The Hitchhiker’s Guide to the Galaxy is a powerful organ. Indeed, its influence is so prodigious that strict rules have had to be drawn up by its editorial staff to prevent its misuse. So none of its field researchers are allowed to accept any kind of services, discounts or preferential treatment of any kind in return for editorial favours unless: a) they have made a bona fide attempt to pay for a service in the normal way; b) their lives would be otherwise in danger; c) they really want to.