People often ask who might replace the nature broadcaster, who turns 100 this week. The truth is that he’s irreplaceable, but a wide range of voices are attempting to fill his shoes.

People often ask who might replace the nature broadcaster, who turns 100 this week. The truth is that he’s irreplaceable, but a wide range of voices are attempting to fill his…

Madeleine Finlay hears from natural history writer Patrick Barkham