Thank you so much for your advice annie&tibbers – i'm monitoring him closely now and tomorrow i'll call Dr. Burstyn to check whether I should send him down for an examination. I've read the reviews on Yelp, apart from the people skills (haha) he really does seem like a nice person – there was a hidden review about him helping a homeless guy and his rabbit. That's really admirable. Someone should organize a Vancouver hedgey meet up one day!
Thank you again, I've spent the last hour getting vinegar and cleaning his cage like you mentioned, hence the late reply.