Gentlemen, Just reading about Chris Crocker-White and his engine has reminded me of my first engine a "Lister D". It was bought as a runner but needed work so took it home and put in the garage on two bits of wood so that flywheel cleared floor. Put in petrol and cleaned plug, swung it over and it started, stood back to admire just as it fell off wood and proceeded to spin like a top. Ever tried to stop a lump of spinning cast iron before it did any damage, I managed after several revolutions to grab the plug lead and rip it off the plug then shut the garage door and went inside. Next time it was bolted to a piece of wood. :-))
Martin P