HI A321,
I agree with you, they were bought to replace the Hawks at DERA/QINETIQ Llanbedr being used as Shepherd Aircraft as the Raf wanted the T1s back, the O/C at the time at Llanbedr was ex GAF pilot who I believe got them to replace the Hawk as the shepherd for the Jindivik Drone to be used on the Aberporth Range, they were still in Luftwaffe camo when operating from Llanbedr before painted Black when Llanbedr closed and they went back to Boscombe Down. I think 9 were bought 4 operational and 5 spares