In reply to graeme jackson:
> (In reply to ex0) possibly a pamphlet rather than a novel?
Ha! Further enquiries reveal that this is definitely a Val McDermid, one of the vehicles is a "Jeep" (I think this means a 4x4), on its way to a bothy or a remote house.
I wouldn't have given this much hope but I previously tracked down a Rock Hudson film for her called "Blindfold", based on similarly vague ramblings which turned out to be correct.