Had another look inside the door last night, I may be able to get a small stubby in there in to change the base. I won't attempt it just yet as the hinge I ordered on ebay may fit that base, then all I have to do is grind and adjust. Also, its flat screws and they look like they've bee sprayed when the door was painted, so it may be a harder task than it looks.
On a plus note, I regassed the aircon myself and it seems to have fixed that, result.
Just the o2 cat problem to sort and all the rattles and knocks, oh and the radio (not that I want to listen to anything I just want nav) and some permanent fix to stop the lights coming loose and falling out.
I love the looks of the car which is why I wanted one, I also wanted a hobby, but I underestimated how much hard work was involved.
But you guys and this forum has been a great source of information, and I am grateful for everyone's help so far.