Its initial "customers" were the then new Gemini Observatory, the former ROE observatories in Hawaii (the James Clerk Maxwell Telescope (JCMT) and the United Kingdom Infrared Telescope (UKIRT)), and a former RGO observatory, the Isaac Newton Group on La Palma, Canary Islands.
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Its head office was at Polaris House in Swindon, Wiltshire, but it also operated three scientific sites: the UK Astronomy Technology Centre (UK ATC) in Edinburgh, the Isaac Newton Group of Telescopes (ING) in La Palma and the Joint Astronomy Centre (JAC) in Hawaii.