An American Werewolf In London (1981)

Director: John Landis

Starring: David Naughton, Jenny Agutter

Available at Amazon

Locations

Black Mountains, Powys

Clink Street, London

Piccadilly Circus, London

Regent's Park, London

Tottenham Court Road, London

Trafalgar Square, London

Windsor Great Park, Windsor, Berkshire
The scene where the werewolf first attacks was filmed here.