Back in 2019 the biggest mistake I made on our great 3 week vacation in Europe was driving around to locate a SIM card, I wanted help setting it up. I never did find the help, eventually bought the SIM from a dollar store and figured it out myself on the trunk of our rental vehicle.
3 years the wiser I presume I can get off my plane in Gatwick, walk into the WH Smith store, and grab a couple of EE SIM cards fairly painlessly, correct?