Tatler's features director Sophia Money Coutts gives some sound advice for anyone expecting royalty at their wedding (Pippa Middleton, we're looking at you...)
1. Make the Royal do a reading in church. Important that all your guests know that you're grand enough to have an actual Royal at your wedding. Not only will their name be printed in the order of service, everyone will get a chance to gawp at them. Not that Corinthians one about clashing cymbals and gongs though. Pick some sort of cringey sonnet about love for them to read instead.
2. There will probably be paparazzi outside the church, waiting to capture a photo of this Royal. Walk in and out of the church v-e-r-y slowly so they can also get a shot of you. Particularly good if you can stand creepily close to the Royal for a photo alongside them. The papers will definitely print that one.
3. A nifty way to save cash is to ask the Royal if they can come to the wedding in one of their big, posh cars - ideally a Bentley or a Rolls Royce - and if they'd mind giving you and your new husband a lift back from church to the reception in it.
4. Make sure whoever's making the speeches reiterates that there's a Royal present. 'Your Royal highness, ladies, gentleman' and so on. Extra points if you can get a Royal to make a speech. At a Norfolk wedding in 2013 where Prince William was best man, he opened his speech with 'James is the poshest man I know…' Lols ricocheted around the marquee.
5. Seat the Royal next to Auntie Meredith. Royals are incredibly good at small talk and most of them have excellent manners. Auntie Meredith will be charmed.
6. No garlic in the canapes or dinner. The Royals don't eat it because they worry about their breath given that they have to meet so many people. See? Even they have their insecurities.
7. You should probably have a 'no social media' rule at your wedding if there's a Royal present, but make sure that you get into the photo booth with the Royal at some point and take lots of photos for your fridge. This applies if you're the bride or groom or just a guest. That way, when you have people round for dinner and they peer at the photos stuck on your fridge, you can say 'Oh yes, just me and <insert name of Royal> larking about. They're terribly sweet in person.'
8. Make sure there's a special loo for the Royal. They can't use normal portaloos like the rest of us. Prince Charles even carries around his own loo seat with him
9. Make use of the fact you'll have beefy security men there protecting the Royal, so when Uncle Andy starts getting lairy on the dancefloor they can bundle him off for a glass of water.
10. Finally, if you are a guest at a wedding where there's a Royal present and you are wearing the same coat or dress as that Royal, don't panic. You will find it funny eventually. This happened to my friend Sarah, who went to a Gloucestershire wedding in 2014 in the same Missoni coat as Kate Middleton, both bought from Bicester Village. Sarah ended up on the front page of various papers, pictured next to Kate in the matching coat, having apparently committed a grave 'fashion faux-pas,' and all her friends, especially me, had a jolly good laugh. The good thing is she can also laugh about it now. Three years on.