Think that tail wheel of Blenheim have a problem, still offset to right even if rudder is trimmed to left. The command "Lock tail skid" (dont find "Lock tail wheel) dont work in this plane.
http://img16.imageshack.us/img16/1976/rudderblen.jpg
http://img832.imageshack.us/img832/3927/rudderble.jpg
Sokol1