The Llandarcy Oil Refinery, also known as the National Oil Refinery, BP Llandarcy and Skewen refinery, was the United Kingdom's first oil refinery, initially opened by the Anglo-Persian Oil Company (renamed the Anglo-Iranian Oil Company from 1935 and the British Petroleum Company from 1954) on 29 June 1922, although operations had begun on 1 July 1921. Before this, the only oil refined in the UK came from Scottish shale.