The Health and Safety Executive publishes guidance on seating in The Event Safety Guide and guide to fire precautions in existing places of entertainment and like premises.
For sports grounds, there is no standard allocation of space for a seated person. However, my Department’s document Guide to Safety at Sports Grounds does provide guidance on minimum seat widths and seating row depths. The purpose of the document is to give guidance on how to calculate the safe capacity of a sports ground.
More broadly, my Department, along with the Department of Health and the Department for Education and Skills, is taking joint action to halt the year-on-year rise in obesity amongst children under 11, in the context of tackling obesity in the population as a whole.