Christopher Oram’s glorious design projects luxuriance and a protest against lavishness. Here is Catholic high colour and Protestant plainness: an austere set and rich costumes. The huge cross that is from time to time illuminated at the back of the stage is made of bricks, as if it were not only a Christian symbol but a structural necessity.Ben Miles’s performance as Cromwell is crucial and it is magnificent. He is not, as he is in the novels, seen as a bashed-up child, the son of a Putney blacksmith. Yet he suggests elements of the background at which the courtiers sneer. At his first entrance, he is chewing as he speaks; as his authority consolidates, his accent subtly poshes itself up.