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https://www.expresstest.co.uk/book-a-test/testing-centres/gatwick-airport-walk-through-antigen-lateral-flow/?testType=Lateral+Flow&productType=Fit+To+Fly

If you're going out of Gatwick, the testing site in the airport is pretty well-run. £25 for an Antigen test or ~£40 for PCR and results sent to your email within 30 mins, you just book a one hour time slot in advance.