I am not particularly bothered about the cultural wearing of the niqab but thinking aloud I have the following questions:

Do driving test centres allow women to take the driving test wearing the niqab and if so, how do they identify that the person is who they say they are?

Do universities allow women to sit examinations wearing the niqab and if so, how do they identify that the person is who they say they are?

Do employment agencies (who are supposed to check that applicants have the right to work in the United Kingdom, usually by looking at the applicant's passport) allow applications by women wearing the niqab, and if so how do they identify that the person is who they say they are?