Hi craig,
ok then doing this as suggested earlier in thread, I get 79-1/8" on the door corner to corner.
So the solution is thankfully, to tweak the hinges. So I've got spanners bought, as access restricted.
Now I have 4 hinges: so how do I go about this pulling the door 'in' at the top-? Is it to loosen off the two middle ones.. & tighten/ pull the door in at the top one/ get the other two back tensioned-up? Maybe wedge door 1st?
Thanks, Zoot