Knights of the Wobbly Tale

What would you do if three time-travelling knights appeared in your garden shed? And what would you do if they…er….well….(let’s be polite in the blurb) passed wind a lot? Jack takes them to school where Sir Trumpsalot, Sir Gaseehad and Sir Windibot get up to some seriously silly medieval mischief. The head teacher tells the Great Myster-eeeey that a dragon is heading for the school. But all is not what it seems. “Fear not!” cry the knights, “We will slay the dragon!” Can the trumping knights save the school? Or will things go horribly, hilariously wrong?