I can see where you're coming from Martin (or is it with a y, apologies if so) and as a fellow petrol head, obviously want Euan's mate to be happy with his car. Hindsights a wonderful thing, but no help to the poor chap now

.I do feel for his predicament, but can also see where the mapper is coming from.
Possibly an empasse, the guy didn't make clear he'd want further work done elsewhere (and thus access to the maps) but the mapper may not have been clear up front about his policy regarding his mapping work (and locking the maps), which may help Euan's friend's argument?
I hope some middle ground can be found.