Help!
Thanks a lot Ryan, Mel, Dan and Chris.
Sorry nothing to report - no further on.
I was hoping I'd have the flitch panel welded by now but I have been measuring doors and checking fit before doing so. The drivers door has never sat right since I got the mini. It always stuck out a bit at the lower back corner and has never latched well. I had thought it was flex in the hinge panel - I checked the hinges Chris, but there is no wear. The hinge panel certainly flexes just now. Here are pictures of the fit of the door.
Big gap at top front even bolted as high in the holes as possible

Rubs at top rear if not carefully opened and shut




There are no shims - I wish there were to take some away.
And the better passenger door



There is a shim top and bottom of the passenger door hinges.
Do I go ahead and weld up to stiffen things up?
Do I elongate the holes to bring the door up a bit?
I have measured both door apertures accross from the top hinge bottom hole to the door striker (96.3cm) and also from the door step to the top door lip where the rear of cross member inside the car is (92.8cm). They are the same give or take 2mm.
Could a pattern door of poorer fit have been fitted at some time?
Sorry to bother
Hugh