I'm actually not the best qualified to comment on Britons in general, as I seem to mostly attract/interact with discursive people - and I spent a long time living abroad - but I guess I haven't found people to be as incurious overall as you. Misinformed however...

That said, I think that the key element to my argument is that here in Britain, Thatcher not only won an election, she won the discourse to the point that many people believe that "she saved Britain from the unions / saved Britain from itself / saved Britain from the looney left."

I am a similar age (and possibly partly similar profile) to this lady. The key difference could be personality, it could be that I grew up in the North of England (which received the harshest blows from Thatcher) or it could be that my Dad has always been interested in politics, so I grew up aware that there is a debate to be had about how things are done...