DS (3.5) has been potty trained for approx 3 months, is absolutely fine and reliable,but still won't use our or any toilet - has to be a potty or al fresco (if appropriate). We have muddled along this far, but pre-school is gleaming on the (very near) horizon. He's going to have to use (cute and tiny) toilets there. Any suggestions as to natty products or fun things to wee on in the toilet while we do our final push (as it were). Staff at the preschool are confident it won't be a problem once a bit of peer pressure is exerted, but I'd like to spare him the added dimension of it being his first time. Have tried bribery to no avail, and he's not frightened of the loo 
. All suggestions gratefully received.