Wisley was a contractors airfield mostly used for production flight testing of civil aircraft (although the Valiant was tested there) after final assembly and first flight from nearby Brooklands and was nothing to do with RAE.
The VOR/DME was a later addition to provide a 4th stack for Heathrow although I dare say Vickers had their own 'private' letdown using it although it wasn't needed as they had a fantastically powerful radar.
Last edited by chevvron; 23rd October 2012 at 18:47.