I always buy a few jars of vecon when its on offer, only have 2 jars now remaining in the fringe...
have used Aldi's Grandessa Mighty Yeast, when H&B ran out of vecon, it worked however can't really comment as a comparison, cos it was only for a couple of months, i'm sure it would be just as good!
one thing i'm certain off, homemade will ALWAYS out Fish win π...over fishing-shop bought c r a p!π