Comprehensive school educated, I grew up in Huyton (the last Scouse outpost before becoming a wool). Even there, when I was a kid in late 70s/ early 80s, I heard about Jimmy Saville. There’s no way media, governments and others in positions of power and responsibility didn’t.
Jimmy Saville carried out the most reviled crimes at a historically significant level for decades across multiple organisations. He had about two-minutes uncomfortable questioning in TV shows he agreed to. That's how seriously you should take the British media's claims to hold people to account.