Best improv class

I'm really sorry if something like this has already been posted (and i'm sure it has) but i am looking for an improv/acting class that i can drop in on to help me prepare for my upcoming slew of auditions. i used to take the VCA classes but i am in sydney now, so does anyone have any class/teacher that they can recommend to me? I'm a little rusty, and also a bit put off acting by recent events (see other thread if you want to hear my rant...) thanks in advance, Alison