There is probably only one thing that Ann Widdecombe and I have ever agreed upon: we both think it might be a really good idea to stick William Wilberforce on the Fourth Plinth. Why not? It’s nice to have contemporary art in Trafalgar Square, of course, but surely there are few other reforming characters as worthy as the great abolitionist? And Wilberforce was many other things besides – though not all of them would necessarily impress the nation to quite the same degree.

Few theatrical collaborations have been as successful as that achieved over five plays, two films, several decades, and numerous awards by the playwright Alan Bennett and the director Nicholas Hytner, who had jointly made a habit of art well before Bennett decided to write a play of that very name, premiered in November 2009 at the National Theatre. Now, More4 has come along with a documentary chronicling the two men's collaboration on a work that is itself about a collaboration. And if Adam Low's behind-the-scenes take on an essentially private meeting of minds leaves you wanting more, well, even some of Bennett and Hytner in action is better than no glimpse of them at all.

I'm not sure that Alan Bennett and The Habit of Art will prove all that revealing for those already interested in and admiring of a playwright who, intriguingly, tends to resist being put under the spotlight himself, even as his own plays offer often deeply intimate, sometimes scabrous views of people no longer around to answer back. (Those who saw The Habit of Art during its extended run on the South Bank and then on tour will have learned more than they could ever have anticipated about the poet W H Auden's sexual, um, habits.) How open was Bennett willing to be, then, about a process - writing - that is itself notoriously tricky to dramatise? Enough to satisfy up to a point. And yet it was left to Hytner briefly to play the analyst, making clear that the play's original title, A/B, referred not just to its putative subjects, Auden and the composer Benjamin Britten (pictured below), but, of course, to the initials of its author. (This script's intermediary title, Caliban's Day, reported previously, went unmentioned.)

Instead, we got footage of Bennett and Hytner reflecting both jointly, and individually, on the play's birth pangs, along with snippets of commentary from its enormously talented leading men, Alex Jennings (Britten) and Richard Griffiths (Auden), the latter of whom stepped in during rehearsals following the departure due to illness of original co-star Michael Gambon. (The full impact of Gambon's exit on the rest of the company was not explored.) This recent material was interspersed with a version of, presumably, much the same enquiry into Auden and Britten's own professional and personal dovetailing and eventual separation that Bennett must have engaged in himself, though Bennett's own preface to the published script of the play is, in fact, more complete on this front than the documentary manages to be.

That said, it was fascinating to be reminded of the extraordinary ravines of Auden's face and how aptly evocative they are of Gambon, next to whom the smooth-cheeked Griffiths was about as far-removed physically from the poet he was asked at the 11th hour to play as it was possible to be. (Hytner's finished stage production made a wry joke out of that very fact.) And one might have liked an even greater investigation into the process whereby an apparently straightforward bioplay morphed over successive drafts into a far more complex and moving look at the relationship between play and playwright as Bennett decided to encase his Auden/Britten face-off within a show that just happens to take place within the very rehearsal room that Bennett can by now call a second home - a play, in other words, first intended to lay bare the lives of others turned into a meditation in some way on its creator.

With musical scoring including Britten's always welcome Sea Interludes, Low's film hinted at a creative reckoning in Bennett that finds rough equivalents to Auden and Bennett in his play, images of Britten walking the Suffolk beach paralleled by shots of Jennings making his way down one or another backstage corridor at the National. I waited in vain for a recapitulation of that delicious final speech in Bennett's play in which Frances de la Tour's inimitable stage manager, Kay, spoke the author's title. But to see Bennett visibly worrying his latest creation at this point in a career spanning a half-century of kudos was to be reminded that the habit of art can be as hard as, with luck, it is glorious. Let's hope it's one habit Bennett doesn't kick any time soon.

Overleaf: more Alan Bennett

What a pair of teases Jesse Armstrong and Sam Bain are. The co-writers (and co-creators, with Andrew O’Connor) of Peep Show write only one short series of this sitcom each year but such is its pull that fans don't forget and move on to other offerings. No, we wait with mounting glee for the programme to return to our screens and, let joy be unconfined, the seventh series started last night.

There’s a surreal sitcom waiting to be written about the often-told story of when Charlie Higson and Paul Whitehouse were Stephen Fry and Hugh Laurie’s plasterers for a while in the early 1980s. Here’s the pitch: F and L would play caricatures of themselves in the mould of the posh twits they played in Blackadder, and – for extra comic frisson – H and W would play it straight while appearing (as the story goes) naturally funnier than their professional Oxbridge comedy-writing superiors.

The title could have used a bit more work, I'd have thought. No, Peter Mandelson was never "the real PM", and won't be now. As for the real Peter Mandelson, there is no evidence that any such mythical beast exists. And why hadn't Lord Mandelson become prime minister, film-maker Hannah Rothschild asked him in one of her deferential voices-off moments? Because Tony Blair and Gordon Brown had entered parliament in 1983, Peter explained with exaggerated patience, while he himself had only got there in 1992. He was stuck at the back of the queue and had to wait his turn. This being the Labour party, an organisation which makes the Titanic look state-of-the-art, his chances of speedy advancement to pole position were more or less nil. And lots of people hate him of course, though he left that part out.

Any period drama that crops up on Sunday nights is now automatically billed as a potential replacement for Downton Abbey. Any Human Heart has duly been described thus, but isn't. Converted into a four-part series from William Boyd's 2002 novel, with a screenplay by Boyd himself, it's the story of the writer Logan Mountstuart, whose long life spanned the major events of the 20th century while bouncing around between various continents and relationships.

The renaissance enjoyed by Leonard Cohen over the past few years is not only thoroughly welcome and entirely justified, but also partly a testament to the strange and powerful alchemy that sometimes occurs when the defiantly high-brow is swallowed whole by popular culture.

When The L Word, an American drama series following the interconnected lives of a group of lesbians in Los Angeles, first aired in 2004, much of the acres of coverage it attracted made disbelieving mention of the cast members’ attractiveness, which is an implicit suggestion that lesbians are more usually at the back of the queue when good looks are being given out. Rather irritatingly, Lip Service, a drama series following the interconnected lives etc etc...

If you found yourself thinking that you were watching Mission: Impossible rather than Imagine, you could have been forgiven. Alan Yentob had clearly been banned from meeting Ai Weiwei in China, and so one of their interviews was conducted over a webcam, with Yentob sitting in the dark, like some spymaster of the arts.

With a title like Accused it would be easy to imagine that Jimmy McGovern’s new series was going to be just another generic courtroom drama, but McGovern would never be that predictable. The man who made Brookside grittily unmissable back in the 1980s, reinvented the TV crime genre with Cracker in the 1990s, and then settled into full maturity with The Street which ended last year, would probably rather retire than deliver anything that wasn’t in some sense fresh and innovative. He’s now one of only a handful of TV writers whose name alone guarantees a certain kind of direct, powerful drama honed by heart, intellect and political idealism.