My understanding is that all Shropshire bases were involved in Horsa training with Tilstock as the hub. Tilstock departures to land as far away as Cosford and eventually be recovered by further aerotow. Therefore not being based at these units is not indicative in itself of who operated there. Tilstock is famous for having a Stirling tug overshoot and turn onto the A49 Shrewsbury Road. The most unspoilt of the airfields is High Ercall, although the origins of Sleap are also clear to see. There are photographs on the net of Horsas being towed by radial engined Halifax. Not many of Hotspur or the tank carrying glider Hamilcar.