OK, so I've cleaned the points, they weren't stuck, horribly burnt and open and close OK.
I've put it all back in and when I crank the engine by hand holding the spark plug against the head, I get one lone spark in all the revs, sometimes two, sometimes I can crank the engine a couple of times and get no spark, so it seems spark is my issue here.
I might try and find a new condensor for it (if anyone can point me in the right direction). I took the condensor and points to the mower shop and they said "go home, we can't help you".
Onwards we go :-)
