Bill from Code Red actually looked into SAVAGE INTRUDER, but the problem is only a video master can be found by the rights owner (no film elements). So, it's a no-go until film elements can be found. :(
Cushing AND Lee! Michael Gambon and Diana Dors are also in the film. And it was directed by Peter Sasdy, one of the best of the late Hammer directors, who also made:
THE STONE TAPE
HANDS OF THE RIPPER
TASTE THE BLOOD OF DRACULA
COUNTESS DRACULA