Prince William has wished Sir David Attenborough a very happy 99th birthday as the famous broadcaster marks the key milestone by releasing a new film about the importance of saving the ocean. In a message released on social media, the Prince of Wales said: "As he turns 99 today, in his new film, Sir David has once again reminded us of the need to protect natural habitats - this time those beneath the ocean.

"He has dedicated his life to ensuring we understand the realities of what mankind is doing to the planet. However hard-hitting his message is, Sir David always leaves us with a sense of hope and optimism that all is not lost and this film is no different.We must act together, with urgency, to restore our oceans.Happy Birthday, David. W."

The premiere of the film, Ocean with David Attenborough, took place on Tuesday evening at the Royal Festival Hall.

William attended a matinee in a "private capacity", along with hundreds of children from schools across the country, while the King attended the evening event.

King Charles, a lifelong environmentalist, walked the ‘blue carpet’ at London’s Royal Festival Hall before meeting the beloved natural history TV presenter.

The King has met Sir David several times before as his work as an ambassador for the natural world and his passion for the planet overlap with the King’s own work to promote sustainability and protect nature and the oceans.