2. The elephant in the room

The two brothers join their father Prince Charles and Sir David Attenborough at the Natural history Museum for the premiere of Netflix documentary Our Planet. It’s game on, as both houses post about the event.

SUSSEX ROYAL: harry and Meghan’s team fire off four images and a video, starting with a respectful black-and-white one of the four men at the premiere. Then comes the Insta game-winning shot: a previously unseen photograph of Meghan and harry attaching a tracking collar to an elephant in Botswana (far right). INSTA-STATS: The new account has already got more than two million followers, 447,000 of them liking the new post. WINNER: SUSSEX ROYAL

INSTA-STATS: Nothing beats getting down in the scrub with a bull elephant; the Wills video has just 237,000 likes in comparison.

KENSINGTON ROYAL: Team Wills and Kate choose a different blackand-white shot of the line-up, then another seven images, including a video of Prince William interviewing Sir David in Davos.