In answer to the question about UK postcards, yes, I wrote a post back in 2017 (but can't find it now) warning people about that, after our bad experience in Scotland sending quite a few cards, few of which arrived, and those months late. NEVER EVER buy those fake colorful stamps from a souvenir shop. Only genuine Royal Mail stamps from a real post office. The fake ones are sold by a ripoff company which for some reason is allowed to run a scam post office. When you put cards stamped with their product in a mail box, that company gets them instead of Royal Mail. They do route them around the world before they ever get anywhere (if they arrive at all). When I posted that in the "tourist scams" page, I got a few kind of snippy responses from people in the UK (as well as some saying thanks for the warning), saying essentially, what's the problem, they're just cards, people should know we have fake post offices here, and so on. Well, when you add up the steep price of cards and stamps these days, and the time wasted writing them if they don't get there, it is a pretty nasty little scam that can be quite expensive. And why would it occur to someone to question whether postage stamps are the real thing, if they are from a place where a stamp is a stamp, until they are a victim of this? Don't fall for it!