Personally, I think it would be good if there was a requirement that people who stand for election have had some work experience outside of politics.
Once they are MPs, though, I don't think they should have directorships and other positions in companies that might lead to a conflict of interest and to them neglecting their parliamentary duties.
I do agree that those with professions that require continuing professional development criteria to be carried out in order for professional status to be maintained should be able to do the minimum hours required in order to do this. They may, as has been said, be voted out after five years and may then wish to return to their former employment.