Filming Location:
Hillingdon, London
The Mark of Satan
Hillingdon hospital and its morgue were used for the locations. Thanks to Jim, a visitor to the forum for confirming the location.
Kevin Flanagan, a major location finder, thinks that the library, which was originally thought to be Maidenhead, is in fact Oak Farm Library, Sutton Court Road, Hillingdon, as it has the same style roof and is located just 1.5 miles from the hospital.
Kevin has found another library only a couple of miles further out, in Hayes which could also be a contender. So the jury’s out on this one !