The National Portrait Gallery is a national treasure. Not because it has nice pictures (although it does have that too), but because it has the most amazing archive. An archive that is, almost literally, a treasure trove. It is, of course, out of sight and therefore out of mind to the casual visitor. But for a history buff, there is a visceral thrill knowing that there are a million or so objects (the number is give-or-take), many of them only superficially catalogued. Anything may turn up.

“Henry VIII is the only king whose shape we remember,” David Starkey tells us in the first of a new series of “polemical essays” on British art. To demonstrate, he reduces the king’s form to its bare Cubist geometry. He sketches a trapezoid for the chest – an impressive 54 inches in life, as attested by his made-to-measure suit of armour; two “chicken-wing” triangles for the puffed sleeves; two simple parallel lines for the wide-apart legs. Oh, and a small, inverted triangle for the codpiece. This last addition, as originally drawn-in for comedic value by the Tudor historian G R Elton, and fondly recalled, never failed to raise a titter amongst the callow students of Dr Starkey’s Cambridge undergraduate days.

Where were you? For those of us too young to experience Kennedy’s assassination, which realistically is anyone under the age of 55, the Royal Wedding is the next event along the chain of history that simultaneously impinged on much of the globe’s consciousness. In July 1981, I was on a French course in Clermont Ferrand and the whole group watched Lady Di get Prince Charles’s names in the wrong order on a TV in class. There must have been French commentary. Were you anywhere in particular?

Acclaimed British mezzo Sarah Connolly prepares for the title role in Donizetti's battle royal of rival queens Maria Stuarda. Her return to Opera North in the bel cantorole of her choice will be one of the highlights of the UK opera season and in this revealing podcast she gives fascinating insight into her extensive preparation and "anatomisation" of the roles she performs - right down to the fine detailing here of Mary's temperament and bearing, and even her height.

What is going through her head in the moments before the "confrontation" which in reality never actually took place? What finally provoked her in the moment she floors Elizabeth I with her "royal bastard" insult? And what must have she been feeling as they built the scaffold outside her prison room at Fotheringay Castle? Connolly leaves nothing unexplored. The inside of her score is a written chronicle of what is required to get inside Mary's head...before she loses it.

Let’s be honest, you never expect much sense from BBC Three. You don’t count on it for, say, depth of perspective. The channel which each week spews fresh torrents of hectic DayGlo entertainment in the specific direction of a desensitised demographic tends to steer clear of the big subjects. War and such. Girls on the Frontline, therefore, did not inspire much hope. That title. On any other BBC channel, it would have been women, not girls. Still, a camera crew was allowed to follow several women on a six-month tour in Helmand province.

What should a choreographer set before a Prince for a Royal Gala performance when his finest hour is a portrayal of Royal buggery with a hot poker? Well, possibly (sotto voce) clogdancing cobblers and pegleg pirates might be found more suitable, and plenty of children on stage. So peglegs and clogdancing is what Prince Charles will duly be served tonight at the celebration of 20 years of Birmingham Royal Ballet. These are not times to be challenging any more.

Prince Charles and the Duchess of Cornwall will attend Birmingham Royal Ballet’s 20th anniversary gala tomorrow night celebrating two decades in Birmingham for the company which was once Sadler’s Wells Theatre Ballet. The Prince of Wales is President of BRB and the Duchess is Patron of Elmhurst School of Dance, now Birmingham-based and associated with BRB. The move out of the capital made in 1990 by then director Peter Wright was seen as high-risk, but it was backed by Dame Ninette de Valois, then 92, who also approved of Wright’s succession by the young choreographer David Bintley.

The latest official royal portrait, and the first painted portrait featuring the Princes William and Harry, hangs in a small room at the National Portrait Gallery among a selection of royal portraits of the Windsors. There’s the rather quirky one of the Queen Mother, painted in 1989 by Alison Watt, an artist who sought to capture her sitter “as ordinary as possible”. What our attention seems most drawn to is the china cup turned upside down on the arm of the Queen Mother’s armchair. Eh?

For a choreographer the moment your work becomes a classic is when the audience tells you that you’re casting it wrong. I’ve seen Matthew Bourne’s Swan Lake more than a dozen times for professional reasons since it first took off from Sadler’s Wells nearly 15 years ago, and it’s not Adam Cooper’s blinding image all those years ago that’s telling me the press night cast last night wasn’t delivering what the work is worth. It's because I have come to own this piece in my own imagination.