The Ashmolean Museum in Oxford has an info leaflet suitable, it says, for ages 7 upwards. The leaflet touches, coincidentally, on events in Westminster though in a different century. Here is a slightly shortened extract: “King Charles 1 had fallen out with Parliament because he believed that God had given him the divine right to rule his way…but Parliament disagreed…The King was tried, found guilty of treason and executed.”
Just saying.
