I assume you don't have residency. 99.9% of holiday makers pass through the airport with no questions, just a grumpy
Police officer who takes great delight in stamping your passport.
However, you can be asked:
Where are you staying, evidence needed.
When is your return flight, booking confirmation needed.
How much
Money do you have, bank statement, show cash or cards.
I haven't heard of anyone being stopped and asked these questions for several years, but, be aware, it is possible.
The system changes at some point in the future, was to be
November, but now delayed again until next year, where your biometric details are taken (fingerprint and photo). See
https://www.gov.uk/guidance/eu-entryexit-system
Tom.
100% Cotillo based.