Here is a great article about the inner workings of BBC Radio 2 from The Independent. Even Jamie gets a mention:
Despite his stage experience, Cullum says he did “50 or 60 dry runs” in the Radio 2 studios before he felt comfortable enough to broadcast live. “The logistics of pressing the right buttons, getting the timings right and not swearing on the air – those things are quite scary. But after 20 or 30 live shows it feels natural and never less than exciting,” he says. Performing two tracks, Cullum and Russell manage to create the mood of an intimate club in an upstairs corner of the now nearly deserted Western House.
Read the article in full here.