I 'had a go' this afternoon, undid the remaining 2 bolts to the tailgate, and had a thorough look at the actuator, it turned out the locking washer had bent and come off, hence the mechanism had stopped working and the gear was left in the way if I tried to close the boot manually. A little gentle tap into place of both the lever followed by the retaining washer and after a bit of fiddling around, reinstalling left the whole lot working!!
I followed the advice above on the windows and sunroof, complete success!!
Many, many, many thanks to those who helped and guided me.
Have a great Xmas!! Have a glass or two on me!!
Andy