The changing face of Liverpool has been researched by academics at Liverpool University (http://www.bbc.co.uk/liverpool/content/articles/2009/06/22/places_liverpool_city_in_film_feature.shtml ).
The university has compiled information on "over 1,500 films made in and around Liverpool over the last 100 years.
"The database is part of the City in Film project which looks at the relationship between Liverpool's architecture and moving pictures. Film footage from the late 19th century to the present day is collated in the database which can be searched online."
It will, of course, be an invaluable online resource for both academics & ordinary people. However, when I visited the link earlier (http://www.liv.ac.uk/lsa/cityinfilm/catalogue.html ), it appeared to be having teething troubles.
There will be issues over copyright to consider but it seems that, so far, the project is on track.