Really interesting and helpful chat with the health visitor today about a number of things. Thought she passed on a useful piece of advice though with regards to politeness.
She told me that until he’s got a good variety of nouns, don’t worry about please and thank you. Apparently the language therapists say that it can get confused so he might think the cup you get him to say thanks for is called “thank you”. I’ve only taken the lead because my niece is being taught her manners. Fair enough, her language is greatly advanced of his.
I will be helping him a bit more with saying lots of nouns for now and let the abstract stuff like manners come later.