I would trust more to my own judgment than the censor's tbh. There are U films that I wouldn't think suitable for my 7 yo- and 12 films that I would let him watch.
Quick look at the DVD shelf confirms that the Beatles film A Hard Day's Night is a 12. I think somebody says a rude word in it, very quietly. If the language is no worse than what he can hear every day from parents waiting in the playground, then I really don't see the problem.
(Btw, in his school assembly they sing "I get high with a little help from my friends"- sniggers cynically).
On sex and nudity, the censor and I also have different views. I have no objection to nude bodies per se or to 7 yos knowing about the facts of life, but as for sex treated with cynicism, I am quite prudish about that.
And I am VERY sensitive about violence, much more so than the censor, it would seem. So there are films that I won't let him watch because people hurt each other or have an accepting attitude towards violence. Or beacuse the films are generally scary.
Another quick peek at the shelf- yes, several of the scarier Bergman films are PG, or even U. But I can tell you, he won't be watching those for many years to come!
Anyway, this is DVDs: I would not let him go to any place of entertainment where he would be expected to fib about his age. I was furious when his mate's mum took him to a fun fair and asked him to tell the guard at the ride that he was a year older than he was. To my mind, that it a lot more damaging than hearing somebody in a film say a rude word.
Anyway, I would be very careful about what I let other people's kids watch- you don't know how sensitive they are.
And I wouldn't let my kids watch the news. They know that's real- that's different.