A worsening mystery misfire which turned my Triumph Tiger Cub into a non runner solved!

Bearing in mind there were still sparks present at the plug, this had been quite a head scratcher, to the point I almost partially stripped the engine to attend to a sloppy camshaft, which was affecting the points gap. I will, of course deal with the camshaft bushes at some point and cover the job on video, but for now, I have a good runner again!