Swearing
I was wondering whether there was any controversy about the level of swearing in this film when it came out. There's an unusually high amount for a film made in 1969, and the word "twat" is said in the first five minutes.
The language used in the film is essential to the setting and feel. However, many of the Yorkshire miners were strict Methodists and would not have approved of swearing. If my granddad ever heard a rude word on television, he would change channel and never watch that programme again.
I asked my dad about this. He says that he doesn't recall any controversy and that 1969 was about the point when attitudes towards swearing (and many other things) became more liberal.