one storey buildings. In May 1942, the Radar Research and Development Establishment (RRDE) was set up on the site, to develop truck mounted early warning radars. In the second week of February 1942, the German battleships Scharnhorst and Gneisenau escaped from Brest in the Channel Dash. They were undetected until well into the English Channel because German ground forces had gradually increased the jamming of British radar over a period of weeks. The British command had not realized this was happening. In the aftermath, Lord Mountbatten and Winston Churchill approved plans for a raid on the German radar station at Bruneval, near Le Havre. The landing party included D. H. Priest, of TRE. The Bruneval raid (code-named Operation Biting) captured a German Würzburg radar system and a radar operator. These were taken to TRE. During the weeks that followed, the British authorities became concerned that the Germans would retaliate in kind. When intelligence reported the arrival of a German paratroop battalion across the Channel in May, the staff of TRE pulled out of the Swanage site in a period of hours. The former Telecommunications Research Establishment moved to Malvern, taking up residence in the buildings of Malvern College, an independent boys' boarding school. The move, which was carried out in great urgency, is described in detail by Reginald Jones in his book Most Secret War: British Scientific Intelligence 1939-1945. At the end of the war TRE moved from Malvern College, to HMS Duke, a Royal Navy training school, about a mile away in St. Andrews Road adjacent to the area of Barnards Green. Research and development Radio navigation Radio navigation (navigational beam) systems are based on the transmission of pulsed radio beams that are detected by aircraft. R. J. Dippy devised the GEE (also called AMES Type 7000) radio navigation system at TRE, where it was developed into a powerful instrument for increasing the accuracy of bombing raids. Radio jamming The counter measure to radio navigation was jamming. R. V. Jones was the MI6 science advisor and TRE staff worked closely with him, in countering the Luftwaffe's navigational beam technology to hamper the enemy's ability to do pinpoint night bombing raids in what has become known as the "battle of the beams". Robert Cockburn of the TRE was responsible for the development of the Jostle IV radio jammer - the most powerful jammer device used over Europe. At 2 kW