The opening of a body manufacturing plant in Scotland saw the first all-UK manufactured Colectomatic enter service and within five years the vehicle became the market leader in the UK, with domination hitting a high during 1979/1980. This was due in the main to John Allen's ability to comprehend what his customers wanted. The Heil company also exported to counties such as Finland, Sweden, Norway, Austria, Switzland, Germany, Belgium, Holland and Spain.