Servotec Grasshopper G-AWRP, now at the Helicopter Museum, Weston-Super-Mare. Remember it in a shed near Bristows' hangar at Redhill in the late 70s. There was a forerunner, G-ARVN, which I think was also stored there.
Edit: quick bit of research reveals two further Grasshopper IIIs also at THM, along with 'WRP and 'RVN. I seem to recall they were in that shed too, but rather less complete. Probably in the buildings now occupied by Redhill Aviation.