Sometimes these things go in circles. The primary school in our village threw out all it's copies of the old sing along (BBC Radio) books. Fortunately my wife and I rescued and stored them. Now the senior school has asked us to go in each week and have a sing around session with the kids so we've got the words and music to hand. We take all our whistles, percussion and stringed instruments as well and get the kids involved. It's a great session for us.
So any younger folk reading this thread don't get discouraged, just nag your favourite teacher I'm sure there is a folkie in your area that would come in and share some time with you I never met one yet that wasn't willing to give up time for kids.
Regards Baz