I have to agree with Kristy. The thought of crossing over a busy intersection with my family in order to get my toddler to the toilets in Dulwich Baths is beyond achievable, he would have staged his dirty protest long before we arrived! I always try to ensure that we are discreet and out of the way if he needs an emergency pee, and NEVER litter, but we do sometimes have to go in public places like Goose Green/playground.