I find that doctors in the UK are very well trained to communicate using common English with patients. They will generally never use medical jargon without being prompted, defaulting to the simplest English first[0], and if they do use medical terms then they generally introduce them. It must be a particular focus of UK medical education.

[0] every GP says “tummy” instead of stomach or abdomen, something I find a bit infantile, but it does get the job done.