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Random question, but I'm moving to London in a few months, do you have any suggestions on banks or "challenger" banks I should go with? (couldn't figure out how to DM you, not sure if it's possible on Hacker News)
Both Monzo and Starling are good. If you're good at budgeting and never dip into negative balances I suggest getting a cashback or points credit card too, and then you can simply put your income into an instant savings account until you need it for the monthly direct debit to pay off your credit card and earn interest _and_ cashback/points.
Frankly even in the US I personally wouldn’t bother using credit cards. The management overhead of maintaining one (you have to pay it off on time, have 2 balances to look at, etc) is IMO not worth the money.