Maybe it's a glider towing tailwheel; Whitleys were used pretty intensively for this.
A friend of mine told me of how he was being towed out of Brize in a Horsa /Whitley tug when one engine failed; the Whitley didn't have tine to release the tow and it turned upside down taking the glider with it and my friend ended up with a broken leg and a steel plate in his face until the day he died.