In reference to your article on Parkour in the West Sussex County Times (Horsham edition) on August 30, the picture you show of two boys jumping are not just jumping on walls.
They are actually jumping on the roof of the Carfax Dental Practice. Not only is this dangerous it is causing damage and interruption to the clinics below. The roof is not designed for jumping on.
Principal dentist, Carfax Dental Practic, Horsham