Many thanks Laird for these suggestions.
The earth connection was loose, since I had removed the ignition unit.
I have now tried Easy Start squirting into the black plastic opening created by removing the air cleaner hose (picture attached) while cranking the engine and slowly pressing the accelerator. The engine did not fire at all despite repeating this process three times. In the picture you can see that some of the Easy Start formed a liquid and then dripped out of the black plastic opening. Hopefully it will not have damaged the new ignition leads!
My assumption now is that either a dodgy rotor arm or distributor cap is resulting in too weak a voltage pulse to create a spark at the spark plug terminals. Hopefully when I receive the new rotor arm and distributor cap this will get the engine running. If not, I am a little stumped, fuel, correctly timed spark and compression should result in a running engine.
Cheers,
Martin
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