Sharing what I found to be a perfect travel shirt: lightweight, not see through, dries overnight.. best part when it's damp twist it into a rope shape to maintain the crinkles. Looks nice layered over a tank top for more casual look.
UK sizing can be a bit tricky. Can sometimes be found in the States at Nordstrom, Macy's, Bloomingdales. If you're traveling in Scotland some of the shops there carry it.
https://www.seasaltcornwall.com/larissa-printed-cotton-shirt