The Fuel and Electricity (Heating) (Control) Order 1974
This Order prohibits the use of fuel or electricity to heat premises above a temperature of 68°F (20°C). This prohibition does not apply to premises used as living accommodation, unless their heating cannot be separately controlled, or to sauna, turkish or swimming baths, or to premises in respect of which a licence has been granted by the Secretary of State. The temperature of 68° may also be exceeded to the extent necessary for certain specified purposes set out in Article 3(2) of the Order, including the maintenance of the health of certain persons specified in Article 3(2)(a) (eg persons who are ill or under 5 or over 60 years old) and of animals and birds, industrial, research and agricultural purposes, the preparation of food, and the prevention of damage to food, goods, material and growing crops.