Strictly Come Dancing

For an insight into the day job of the BBC Director-General two years into his role, I pop into Tony Hall's plate-glass eyrie at New Broadcasting House. I arrive in the aftermath of one of the regular encyclicals that DGs dispense.

He's sung the praises of the BBC's place in a "thriving, free and competitive market", an alternative to what a colleague terms the "Joni Mitchell" school of heartstring-tugging about the Beeb's innate brilliance.

Stephen Lambert looks a bit like Lenin – bald, with steely blue eyes and a bit unyielding. He can claim to be the man who revolutionised factual television, bringing us so many of the formats that dominate the schedules, from Wife Swap, The Secret Millionaire and Undercover Boss to Faking It.

His most recent hit is Gogglebox, the Channel 4 offering that united David Cameron and Nick Clegg in admiration, when asked during the election campaign which shows they enjoyed.