Paul Naschy always had to set his films abroad thanks to baffling censorship regulations - the Spanish government were worried that if people saw monsters and horrors set in Spain it might give a bad impression of the country (
). Therefore a few were set in Britain:
Dr. Jekyll y el Hombre Lobo
Jack el destripador de Londres - very amusing because in the scenes shot on the London streets, people are blatantly looking and one even points at the camera as they walk past.
La rebelión de las muertas (which I bafflingly have not yet reviewed) - Naschy leaves London by train heading for rural Wales, only to arrive on a RENFE train at a small Spanish station...