One of the Hammer "caveman" movies had topless women in it, and was shown on TV fairly often with toplessness intact. I can't remember which one it was, even though I saw it a hundred times when I was a kid.
I think When Dinosaurs Ruled the Earth was the one.
The Hammer one you are thinking of is probably
Creatures The World Forgot.
That said, I agree the inquiry is probably referring to Quest for Fire.