Well, can't afford a rail jolly down to Tesco in Kernow on a wild book chase, but thanks for the reply richwarwicker. And thanks Brucey for the more in depth search.
Never know, might find something interesting during my regular trawls through the charity shops in Brizzle.
Oxfam Books on Park Street is a good place to spend an hour or so searching. Found a couple of Colin Maggs' books in there recently; one called 'Taunton Steam' and another about the Taunton to Barnstaple line. Got two copies of that second one at ^3.50 each. Spare copy free to a good home. PM if interested.