Naturalist Sir David Attenborough is one of my favourite broadcasters. In fact he’s considered by most as ‘the greatest broadcaster of our time’. The 89-year-old has also been called one of Britain’s ‘living treasures,’ a term Sir David does not like.

“My shoes are very unfashionable shoes. I’m the last in a particular style that was established 30 years ago. People make different kinds of programmes now. I don’t think anyone’s trying to fill my shoes” he once said. Which is true, both literally and figuratively. He is one of a kind. The only person to win BAFTAs for programmes in each format – black and white, colour, HD and 3D. among a gazillion accolades, including 32 honorary degrees.

Although I have had the pleasure of meeting him on a couple of occasions, I actually sent this sketch of Sir David to his production company in Surrey and he immediately returned it, signed.