Under which government did the teaching of grammar rules end?

I'm 35 and I'm crap at the rules of grammar. i.e. what the hell is a pronoun. I know that during my years in education grammar was not taught in the UK in the way it had been taught in the years previously. i.e. if we were lucky we were taught what a noun, a verb and an adjective was. But no way did we get as far as a pronoun. All my friends of the same age are exactly the same. Does anyone know under which government the teaching of grammatical rules was dispensed with?