Filming Location:
Maidenhead
The Mark of Satan
The upstairs of Maidenhead library may have been used for the library scene. Thanks to Jill Finlay who suggested this was the location back in 2006. I haven’t visited the library to make 100% sure the location is correct but the exterior red metal roof structure would seem to confirm it is the right place.
Update March 2019 – Kevin Flanagan thinks that the library may actualy be in Hillingdon, as there is a very similar roofed library there and all the filming took place in and around Hillingdon. He says that there is also a similar library in Hayes. So the jurys out on this one !