My faith is starting to return...
We had to take our MH to Edwards Motors near Worcester as they are our nearest Auto-Cruise dealer and the sat nav needed looking at as it had never worked since we bought the MH.
I had had some good email communication with their chap there when fixing the appointment and prior details; and when we arrived he duly popped up to see us. I explained the issues again (sat nav; plus failure of the TV systems). He took the MH off; came back half way through to update and clarify something. Did the work well within the 2 hours he has estimated he might need. TV now working (blown fuse...and "...here's a couple of spares for you just in case"). Sat nav needs a new card as he diagnosed the head unit was fine. Also he didn't want me to pay there and then, he said he would sort it out with our supplying dealer. He will drop them (and me) a line tomorrow.
I couldn't have asked for more: good old fashioned service. I got his boss's name and will drop him a line.
So refreshing after our current run ins/battles with the supplying dealer...who allegedly pride themselves on the after sales service!