 The project still had no official support , leaving Randle no option but to put together a team of volunteers to work evenings and weekends in their own time . The team came to be known as " The Saturday Club " , and consisted of twelve volunteers . To justify the resources consumed by the project , the XJ220 needed to provide meaningful data to the engineers on handling , aerodynamics – particularly at high speeds – and aluminium structures . These requirements , together with FIA racing regulations and various government regulations governing car design and safety influenced the overall design and engineering direction of the car . 
