I’m afraid very few students can tell the difference between the UK, England and Great Britain. For them , it’s always and only England and even though we try and teach them the difference  and at  first they seem quite happy to have finally grasped it ,sadly  if you ask them one month later, they will always turn to the archi-famous and useful  England. Who cares about annoying a bunch of Scottish people?

I have played this video to teach my elementary students. I hope it is helpful to somebody