To the north of the Royal Ordnance Factory (ROF), Risley, was the site chosen for the design offices and headquarters of the Department of ATomic ENergy (DATEN) after the Second World War. Later to become the United Kingdom Atomic Energy Authority (UKAEA), the offices were charged with the manufacture of the nuclear reactors and process plants at Windscale to help build the UK's atomic defence. Following on from the weapons program, the Risley offices were responsible for the building of the Magnox and AGR designs of reactor in the UK. In 1971 BNFL was set up from the production division of the (UKAEA), and until 2003 its headquarters were at Risley, near Warrington. BNFLs headquarters are now at Daresbury Park industrial estate, also near to Warrington.