You just send your order as an email to UK DS; they process it and send you an email with a link for payment; you pay and the order arrives soon after.
There are no import duties on toys.
Thanks. I do wonder why they've removed the spare parts functionality from the site then. Maybe they had issues with pricing and the back end post Brexit? Anyways, I did actually call them yesterday and indeed, they pretty much confirned as you say (ony saw your message today).
I'm building a custom police station from an existing set we have (6220, store) which seems never to never have the right opportunity to be opened (its for my son). Its turning out quite the project, but fun. Basically a bit like a Lego approach to Playmobil!