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Ok guys problem solved! Thought I should report back with the fix.
Checked Vac lines, a few had perished right at the ends where they are stretched over the flared ends of the pipe, fixed those, - still rough.
Carby was looking dirty internally so gave it a decent hit of carby cleaner - still rough.
Triple checked points - looked a bit wide so regapped to 0.45mm - still rough
Drove to a mates place and borrowed his timing light - miles off!? It was running sweet a couple of weeks ago and i didn't touch the timing so I never thought that this could have changed itself. Turns out the bolt holding the distributor in correct timing is buggered and allowed the dizzy to move. Set it at 10deg with a new bolt and it's running as sweet as ever! The joys of buying an old car - at least I'm learning what can go wrong as I go.
Thanks to all for your suggestions! Appreciated. Pertronix II and Flamethrower Coil are on their way, that'll be next job!