Can't help you with the BBFC certificates, but as for other films being advertised, this might be useful:
http://en.wikipedia.org/wiki/1977_in_film
I have always found wikipedia's year lists to be very useful for putting films into the context of their time (which is something I always like to do.
The Spy Who Loved me came out that year, not sure what month, but that might be a cool trailer to show along side CE3K's trailer.