National treasure Sir David Attenborough was asked to do something quite unusual in a bid to stay warm whilst filming in the Arctic.
Working in temperatures of -18C, the broadcaster was with executive producer Mike Gunton and the team doctor Patrick Avery when they filmed in snowy northern Finland for BBC One's The Green Planet.
Gunton confessed that, even though the scenery was breathtakingly beautiful, it was 'brutally cold' as filming took place, and they needed to get their blood moving again, The Mirror reports.
