“Thank you” seems to be similarly versatile in London. You can’t go 30 minutes without hearing it. Once when I was in a bookshop and approached the counter with a couple books to buy, the shopkeeper opened with “thank you”. To this day I don’t understand what that was about.
Part of the transaction is the performance of a service role - they’re thanking you for allowing them to help you. But also it might be a habit if they’re used to serving a queue of customers (“Thank you for waiting”) or just a polite verbal cue that the transaction has started or again the habit of saying thank you on being passed something hand to hand (often shortened to “ta”).
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