As the war progressed, rationing was extended to other commodities such as clothing, which was rationed on a points system. When it was introduced, on 1 June 1941, no clothing coupons had been issued. At first, unused margarine coupons in ration books were valid for clothing. In the beginning, the allowance was enough for about one new outfit per year; as the war progressed, the points were reduced until buying a coat used almost a year's clothing coupons. On 1 July 1942, the basic civilian petrol ration, announced on 13 March 1942, was abolished (Ivor Novello, a prominent British public figure in the entertainment industry, was sent to prison for four weeks for misusing petrol coupons). Thenceforth, vehicle fuel was only available to official users, such as the emergency services, bus companies and farmers. The priority users of fuel were always the armed forces. Fuel supplied to approved users was dyed, and use of this fuel for non-essential purposes was an offence.