With one lengthy reveal of their children playing in a confected garden, Kate Middleton and Prince William – House Cambridge – threw down the social media gauntlet to Meghan Markle and Prince Harry’s House Sussex.

It’s not quite the War of the Roses, but it has been dubbed ‘the war of the poses’.

While media attempts to invent a ‘feud’ between the Cambridges and Sussexes have fortunately died off since the real news of Archie Mountbatten-Windsor’s birth, there’s definitely Instagram rivalry.

In the less than eight weeks since PR masters Harry and Meghan launched their Sussex Royal Instagram on April 2, they’ve snapped up 8.3 million followers.

That means they’re fast closing on Kate and William’s Kensington Royal account – the Sussexes used to belong to it, until they broke up the band – which has 9 million followers.

While both camps of young, rich, beautiful and (blessedly) fertile royals still enjoy dropping into each other’s manors for a G&T and a catch up, they’re also competing in the same Insta space.

That meant, this week, it was time to bring out the big guns – and we’re not talking Kate and William showing up at Buckingham Palace garden party looking like extras in My Fair Lady.

For Meghan, 37, and Harry, 34, it was a montage of unseen black-and-white photos to celebrate their wedding anniversary (‘One year ago today …’) and gospel choir backing.

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There’s Meghan’s touching moment with her mother Doria Ragland. Harry looking like he’s simultaneously going over his speech notes and wondering where the nearest loo is. Beautiful!

Sadly there was no baby, but Harry and Meghan did go large with his tiny feet on Mother’s Day and are no doubt keeping their powder dry for Archie’s next reveal. Intrigue adds value equals winning.

The Sussexes cagily dropped their offering into followers’ feeds at 5AM (UK time) on May 19 – and thus deftly got the jump on the Cambridges’ flurry of Insta posts celebrating Kate designing a garden for the Chelsea Flower Show.

Kate, 37, and William, 36, have been notable for rarely sharing photos of their children Prince George, 5, Princess Charlotte, 4, and Prince Louis, 1. We’ve seen them only at family christenings, birthdays, weddings and first day of school.

But since the arrival of Sussex Royal and, coincidentally no doubt, Master Archie, that’s changed.

Suddenly we have a photo of the Duchess of Cambridge (still in those unfortunate wedges) emulating Miley Cyrus on the garden equivalent of a wrecking ball plus Louis walking.

Also – this is the absolute sign something’s up – the first ever audio of George speaking.

Yes! While we’re uber familiar with the young lad in his customary shorts, Start-Rites and long socks, he’s never been heard before. (Please correct me if I’m wrong. I want nothing more than to trawl back through Cambridge posts.)

And what did the future king say? He acquitted himself poorly. When asked by his father William what he would score his mother out of ten for her garden, George answered, “20.”

Maths fail. I’ll post the Kumon sign-up papers to KP tomorrow.

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Along with George’s vocal work, there were stacks of shots of the young royals peering delightedly into a fake river and exploring the verdant landscape.

So adorable it was easy to forget they don’t have vast tracts of family land complete with real salmon to explore.

Still, the photos from both Sussexes and Cambridges had the desired effect and both accounts saw their follower numbers rocket up.

Meanwhile, Queen Elizabeth, 92, hit up a supermarket. As always, the Queen – who doesn’t seem to be chasing social followers – was cool as a cucumber and not milking it for the cameras.

“You can’t cheat then?” she asked, as she was taught to use a self-service checkout.

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And the idea of a mobile phone app to pay bills didn’t faze the monarch who said it was useful.

But the Queen was surprised by some of the modern-day shopping basket items, including fish pie and curry ready meals.

“Porridge? Tastes have changed,” she said.