Self employed

Thank you, that is helpful. I had understood that the work was to be taxed, but as I had control of the timing of the visit, arranged the hours, dates, and content of the lectures, I was behaving as a self-employed person. Additionally, I did some research in the visit, which are going into publications that advance my business profile and marketability/expertise as a consultant. Does any of this additional information shift the work to self-employed rather than wages? Thank you.