I’ve just been looking into this too. A friend went to Kinky Ink and said they were great, but it doesn’t make for a day out if that’s a factor. Also, make sure to get gold and not titanium as more people can get a reaction to titanium. Maria Tash at Liberty is supposed to be good and she does have fab designs for adults, but they are so busy that it doesn’t feel so special. Not sure what Maria Tash at Harrods is like. But the cheapest option at Maria Tash is just shy of £300. Monica Vinader is much more reasonable and lovely - but you do have to be over 12. Astrid and Mayu in Covent Garden looked like a nice option, tiny shop in Neal’s Yard. Favourite so far though is Alkemistry - also Covent Garden. Beautiful shop and they do a kids package - ears pierced, earings, photo, certificate, treat in a nice bag for around £120. Plus they will pierce mum’s ( probably God Mother’s too) ear for just the price of the earring/s - if you fancy a cheeky extra earring - as I think I do. I’ve booked this option for my daughter. Good luck!