My feeling is that
wz662 was thinking of the Slingsby T61 which has been know in some places by the name Motorfalke (
here for instance ).
It is the license-built Scheibe SF25-B ("B-Falke", low wing configuration), in a "civilian" version, the Venture being the Air Cadet version.
AFAIK, the main differences are the engine and wing spar.
Fitter2's mention of the Motorfalke was refering to the original Scheibe SF25-A