There has been a suggestion that you are running a competition with your students for the best 'world cup' hair design. Whether or not this is the case it does appear that your class are almost all sporting various national flags cut and dyed into their hair. Whilst there are no regulations or policy directions about lecturers' hair the cloured 'England flag' cut into the back of your hair is not I would suggest the image professional members of this university aspire to. Please consider either wearing a hat when in public on the campus or having the emblem removed.