> The structure of British democracy kept fascists away, not British people.

That sentence was particularly hard to parse. It read like you were saying that the structure of British democracy kept fascists away, but did not keep the British people away (???).

I did manage to figure it out eventually though. I think you meant to write:

It was the structure of British democracy that kept fascists away, not the British people.

Grammar Nazis are always attacking us Grammar Jews.