Ok, so bit the bullet and yanked the engine, will keep you updated on my progress.
Just spent nigh on £750 in seals, clutch, cam belt etc, so she should be a nice reliable motor when done.
Also found some cracks in the top of the exhaust down pipe where it meets the flexible bracket, so will get that welded up.
I have decided to cut out the bent up piece of panel that holds the bottom of the radiator and am replacing it with 3x1 box section.
Cheers
Alex360