I say "Canadian beers", but beer distribution is pretty regionalised, and all but one of the following five are from Ontario. That said, Ontario has a diverse and delicious array of beers on offer.
The emphasis on styles is very different from the UK. Maybe it's something to do with the climate. Compared to the UK, summers here are boiling hot, and winters freezing cold. It does not favour subtle beers. An aggressively hopped IPA, like an oddly refreshing smack across the face with a plank of wood; or a potent and tar-black imperial stout, maybe flavoured with chocolate or coffee; may be just what the doctor ordered.
I sometimes miss an English bitter or Scottish 80 shilling. There's a reasonable selection of imported British beers, but even the big shops don't carry Black Sheep or Caledonian 80. The local brews are tasty though; all of the following are firm favourites and regular denizens of my fridge.