We are all aware of how talented Sir David Attenborough is, but an article in last week’s Telegraph Magazine described his attention to detail where the written word is concerned. Two weeks before filming begins, he is sent the finished scripts – which he then rewrites.

“I’m not unknown to have spent a whole afternoon at least on the first 30 seconds of a script, because you have to get it right” he told Alastair Fothergill, his long-time collaborator. “I enjoy polishing words.”

So there you have it. Advice from a master. A whole afternoon is not too long to spend polishing thirty seconds of script.