Well I don't know what to say apart from that absolutely astounds me. They're the background noise of many British homes and you're severely missing out if these are your interests.
For example, In Our Time alone is 900 45-minute episodes each about an individual topic of science, history, maths, politics, art, culture, religion, etc, sometimes even computing, with genuine experts coming to discuss and debate it starting with a basic introduction anyone can follow and then going into the details.
https://en.wikipedia.org/wiki/List_of_In_Our_Time_programmes
I think literally nobody else in the world produces this kind of super-high-quality and enduring intelligent spoken-word content. Even the NPR in the US is very poor in comparison.
And have you really never heard of the Today Programme or are you exaggerating for effect? It really sets the national daily political agenda in the UK like nothing else. I can't practically understand how you can follow politics and never had heard anyone say 'they said on the Today Programme...'
> I felt it wasn't worth paying £120 to the BBC every year
...but you don't have to, for radio.