Most firms in Europe require American English in business communication. Do your research, BR is the exception in Europe.

There are foreign people "based in Europe" that learned American English. There are people outside of Europe applying to jobs in Europe that use American English.

I had British English during my school years, but get this - we may surround ourselves in different variations of the language, British, American or Aussie - to name the few. Personally I use mix of a those, whatever suits me best, as long as people understand me. Does it matter if I use U or say elevator instead of lift? Don't think so