When WC Sellar and RJ Yeatman's irreverent romp through the pastwas published in 1930 they could rely on a shared national memory of schoolboy history, consisting not only of key dates, wars, monarchs and myths, but also whether each was A Good Thing or A Bad Thing. Thus the Cavaliers were Wrong but Wromantic and the Roundheads Right but Repulsive.
Those certainties have gone, leaving battle to be regularly joined over the history curriculum. History is vital, to make sense of the present and to impart our shared culture. That's why we should all join the debate about which bits must be taught - or rather learnt.