An accessible toilet is designed to accommodate different transfer preferences of wheelchair users and therefore requires more space than a standard or ambulant accessible toilet. In addition to a higher toilet pan and grab rails, it is fitted with shelves (for colostomy bags and general use) and a basin with lever or sensor taps. It has an emergency alarm facility for assistance. A right hand transfer is the more common need but where more than one accessible toilet is provided, alternating transfer hands should be offered. The key details, as set out in current BSI standards, are given below and the illustration shows a left hand transfer arrangement.