Good you made it back home.
Didn't you shut the fuel tap during your chicken sandwich break? I can't imagine why it should flood only when warm.
A simple check is to wait until dark, take the magneto end cap off, start the bike and watch the points. If they look like fireworks rather than the occasional small spark, then the condenser probably is faulty.
It's those dreaded Lucas parts that dare to fail after only 55 years, although the design lifetime of our bikes was 100+ years minimum.
