I've sort of solved the problem , realised that top and bottom rubber seals have perished so have probably lost about 7mm in height ? I will re seal with sealant , I have now removed the door seal that screws to back of floor and that 2 mm allows me to close the door , however it still misses the latch so I am going to drill a slight oval out of door latch and lower it slightly , I will then somehow reattach the door seal so its face hits door but doesn't have metal lip that stops door closing , not perfect but it works for me and as I'm discovering there is no right or wrong answer to series maintenance , as long as its safe and legal.