BF,
in your OP you said that you fermented in a *five* L ashburton PET.
Did you make the liquid up to 4 1/2 L - a gallon, or 5 L ?
Very impressive results, I'm running the figures through my mind
for my 12% version.
PS. You asked about airlocks on the tescos PET. I put a small freezer
bag...