Well Flexplate went on and after some "whilst its out" work on the box that's back in also, fairly straightforward job really, couple of things id recommend:
If your doing it on the floor defo a transmission jack, with the tfr box on that box is mega heavy!!
Mark both propshafts as they are balanced and need to go back in the same way round
mark the torque converter to the box also and the flexplate if your removing that also.
The torque converter bolts, flexplate bolts and prop bolts all need locktite
Make sure the torque converter is fully back into the box before lining box with engine (didn't quite have it engaged on the pump first time round which resulted in the box & engine being locked up!)
Good idea to replace the two reverse torque bolts holding the top of the box in with normal bolts as very difficult to remove without damage to heads.
(all suggestions which seemed to be missing from the Haynes!)
Hopefully this will be useful to someone!