Andrew Duffell: Where did you get that impresison from? Just from a quick look at the site there didn't seem to be any hints at RISC OS.
As for finding other RISC OS users, it's a small world; my music teacher (Martin Gostling) is an avid supporter of RISC OS, as is his friend Mike Smith (and his daughter Amy Smith is a fan of Impression I discovered a little while ago, who is also a teacher at my school). To make the world even smaller, Martin knows the head of IT from my primary school (Sherwood Park) Ann Nutburn, where they (used) to use RISC OS.
Perhaps one day, if they're still around, I'll join a user group - it's a little difficult at the moment when they're a little too far away and often meet in pubs! (I'm underage, which is where the problem lies) Oh well.