The night before the GBBF I had another holiday in craftlandia at the BGBW warm up event. It was set on a boat named after my famous friend Phil's ancestral home.
As you'd expect for a boat there was no cask beer so refreshment came from kegs, bottles and cans from London and American breweries. The stuff from the states was all at the grapefruit end of things, though the UK stuff was more varied: in quality as well as taste. Like the last time I was knocking back beer from the crafty end of British brewing there were a number of beers that weren't worth drinking. Certainly there were more problems than you get drinking normal cask beer in a normal pub.
Cask beer it well known to have problems if quality isn't maintained right through to when it's served, but there seem to be just as many problems with kegged, bottled and canned beer too.