As I had to sack a mod on my site a month ago over the use of a "outdated" word, this is a hot issue for me...
As jj20x was trying to explain, society moves on and Ofcom is bound by the rules of today not yesterday.
I think with these old films (or shows) the way to go about them is not to ban them, but to put a clear warning up on the screen that the films/shows use language which is deemed unacceptable and in some cases, illegal, and so its up to the viewer whether they view them or not.
And before someone says it, I'm not a snowflake. Like most people, I believe, I can be as racist, sexist etc as the next person, but what one thinks and then writes down on a internet site, are two different things.
Think whatever you like, but be careful what you write.

Or even, be careful as to what smilies you use now, as some can become "outdated" too...