WK128 was allocated to the Royal Radar Establishment and flew from 1958, initially as a jamming aircraft for "window" launching tests, then guided weapons fusing and laser designation research. Modified by Flight Refuelling at Tarrant Rushton in 1977 for Beech AQM-37A "Stilletto" trails. To RAE/DRA at Llanbedr in 1978; scrapped 11.04, nose to the RRE's home at Pershore