caravan owners and smaller households. 1956 saw the birth of Calor's industrial division and installation of the first 'bulk propane' tank at the Meredith & Drew biscuit factory in Newmarket. In 1963 Calor Ltd. was formed. 1966 saw a new head office being acquired in Slough, which led to over 300 employees moving into this location. In 1967, Calor was granted a Royal Warrant for the supply of liquefied petroleum gas to Her Majesty the Queen. The company was later granted a second Warrant, this time for supplying Her Majesty Queen Elizabeth The Queen Mother. In 1969 the Imperial Continental Gas Association acquired all the shares in the Company that it did not already own. From the early 1970s onwards sales of cabinet heaters, and with them sales of butane in cylinders, escalated enormously, beginning with Super Ser which rapidly replaced the paraffin heater as the nation's number one choice for spot heating. In a decade, the market for cabinet heaters and the gas they burned grew from nothing to £100 million p.a. This led to increasing demand for storage space, which led to Calor investing in the two largest storage facilities. The first was purchased in 1976: a 30,000 tonne refrigerated storage tank at Felixstowe in Suffolk. The second was a joint venture with Conoco to excavate a vast cavern on South Humberside, capable of containing some 100,000 tonnes of gas supplied from an adjacent sea terminal. This facility, opened in 1985, gave Calor the ability to overcome short-term supply difficulties and to cope with major changes in demand brought on by extremes of weather. During the 1980s, Calor's domestic central heating and industrial markets continued to expand and in 1982 the company's head office moved to a site near Slough. Despite great efforts to establish a nationwide network of outlets, Calor Autogas (vehicle propane) never quite reached expectations, due largely to the Government's inability to recognise its considerable environmental advantages by reducing duty. However, the fuel did become very popular for fork lift trucks, helped greatly by the launch, in 1989, of Calor's exhaust purification system, EPS2000, which enabled vehicles to be used both indoors and outside. In 1986 the company's parent, Imperial Continental Gas Association plc, rejected a bid from Gulf Resources & Chemical Corporation, a company controlled by the Barclay brothers. Instead in 1987 Imperial Continental Gas Association broke itself up into Calor Group and Contibel