Sir David Attenborough has revealed he enjoys reading through the waves of fan mail he receives, but does have one suggestion for anyone who wants to get in touch in future.

Last year, the broadcaster and national treasure joined Instagram and quickly shattered the record for the account to reach one million followers in the fastest time.

However, after being inundated with messages, the 94-year-old has insisted he’s in no rush to embrace the social media site beyond what he’s already posted.

“I’m so old I can’t get used to all these new media but I was persuaded to do so in order to do a message about conservation,” he told Greg James on the Radio 1 breakfast show. “So for a limited period of time I contributed to Instagram, but I’m off now.

“I’m not on it anymore and I don’t intend to go back. I’ve got enough problems with post.”

Revealing he receives as many as 70 letters a day, Sir David continued: “I do my very best [to respond to them all]. Sometimes people, mercifully, don’t actually put their address on because people are so unaccustomed to sending letters.”

“If you wouldn’t mind including a self-addressed stamped envelope I’d be delighted to reply,” he added.

Sir David joined Instagram in September 2020 to spread an urgent message about climate change and its effects on the planet.

In a minute-long video message, he said: “I’m making this move and exploring this new way of communication to me because, as we all know, the world is in trouble.

“Continents are on fire. Glaciers are melting. Coral reefs are dying. Fish are disappearing from our oceans. The list goes on and on.”