while I have not had to yet as not been asked, I have offered my students access to me flying drone for media studies and photography for projects, well offered the teachers the option.
as the school is within a controlled airspace for a small airport I spoke with them and as long as I inform them far enough ahead of time and maintain 200ft flight ceiling won't be a issue, not that I expect to fly at anything that high anyway
I can't imagine big problem for non uk, just be sensible, if small airport easier then a big one, ask to talk to operations or whoever appropriate.
it may not hurt just to pop over to the airport if wanting to do it regularly, put a face to your name, chummy, all that.