I'm with you on this one James. The vast majority of dogs being walked in the parks are well behaved dogs being walked off the lead by responsible owners. Conversely, the minority to whom you refer more often that not already keep their dogs on a lead - we have all seen them and we all give them a wide berth! Lead or no lead makes no difference to the "mess" issue, owners either pick up or don't! Again, in my experience its more often the lead walked dogs whose owners fail to pick up. I walk in Dulwich Park, Peckham Rye and Nunhead Cemetry and have done so for 4 months now, in that time I havent witnessed any threatening dogs. I am surprised by all these references to dogs bothering children, I havent seen this at all, although rarely walk in the park at peak times. I have however experienced (on numerous occasions) children going up to my dogs uninvited and trying to grab / stroke them. Sometimes they have then chased after them when the dog moves out of their way. The parks are open spaces for the community as a whole to enjoy, I agree that antisocial behaviour that ruins the enjoyment of others should be addressed - whether that is dog mess / vandals / badly behaved children etc. It would far easier and cheaper to police the antisocial park users than to invoke a blanket ban that affects a large proportion, the vast majority of that proportion being responsible and not causing any harm / anxiety to others.