Mr M. James (Health & Safety Executive): In his paper Dr. Dickie likened the structure of demountable grandstands to that of both space frames and storage racking. In fact this is not so, as these structures tend to have a form of plan bracing at various levels, while in most grandstands the only plan bracing available is at seating level. This means that, unless the stands are quite small, the taller rear frames will receive no support from adjacent ones for a large proportion of their height. Wear or poorly-designed seat fixings would make this problem even more acute.