Changed the washer and guess what - it fired up!!!
It only fired up after I stuck some petrol in the spark plug hole. It still needs work, the carby is gummed up but I'll give it a clean. The lead attached to the spark plug is frayed and the previous owner had insulation tape around it, is this a common item and what exactly is it called, I couldn't find it in the manual? The muffler is not on securely, there was a perished washer between the muffler and the exhaust hole, is the washer essential? The petrol tank has old stale petrol in it, what is the best way to get this clean.
Finally a big thank you to Bruce(you were right
blush), Joe, Grumpy, Mark and others for helping me with this, I had written this mower off and would have if it wasn't for your encouragement. Who would have thought that the timing was so sensitive on these machines that they would not operate without the blade holder on securely? Anyway you live and learn.