I've just come across British Pathe News website. They have an amazing collection of clips. You can download a low quality version of them for free.
You have to register and actually getting hold of the clips is a long and complicated process but is worth the effort.
I just did a search for "liverpool" and it came back with 693 videos. I have only viewed about 10 so far but am already impressed.
I've watched a very odd "Italian medieval crossbowmen challenge an English team to a match" from 1961, the standard Beatles type film, and some more Italians walking through town with flags.
http://www.britishpathe.com/product_...word=liverpool
If you search for Liverpool you have to watch out for red herrings like Londons Liverpool Street station etc.
Before downloading a video you can click on "Preview Stills" to get an idea what its about and there is also a text description with this.
Mike