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Airport rates are, but checked GBP-EUR today, and same as PO or M&S etc.
Admittedly all about 1.4% worse than getting a bundle of cash from a specialist FX place.
But the scenario is specifically buying currency ahead of time spendable via debit card, as a hedge against falling sterling. Which I am also interested in, as keeping loads of cash has downsides. Is there a cheaper way of doing it?
Something like a Travelex Travel Money Card.
https://www.travelex.co.uk/travel-money-card/
Preload currency onto it, use as a debit card abroad.
Obviously you'll be paying FX fees when you load it, and only use it when it is cheaper than using a zero FX fee sterling debit card, e.g. Monzo