Well I think I've solved the intermittent fault, its now become a total failure.
Yep that's right it won't do a thing now, the last check I was doing was on battery power just to make sure it wasn't my power supply that was causing the issue.
It stopped half way through a slew as before but this time I could hear the motor still whirring away
for a couple of seconds followed by a grinding sound
and then nothing.
So it's definitely a trip the Bintel shop in the morning by the looks of it.
There's always a positive side to this though, you never know what you might come home with.
Ken.
Just to add to this when I was packing the mount up I detected a strong burnt electromics smell so the smoke has got out in there somewhere.
Not good but will get it fixed soon I guess. Haven't had it long but really love this as when it is working it does it so well.