Latest.... After unplugging the transfer motor I wasnt happy with not having the sport mode working, and maybe it was me but didn't seem to change as before, called the Indy and booked it in for next Saturday I told him I'd unplugged the motor and he said it wouldn't like that being unplugged, so to cut a long story short I decided to plug back in and live with it for a week.
Now after plugging back in I now have no codes over 60 miles and lots of stopping and starting all is perfect, could it really have been a bad connection all the time????

Well it looks like I've had a bit of luck for a change, all is good and running perfectly with no bongs!