This is an incredibly niche issue: the number of women who wear the niqab at all are "pretty few and far between", said Shahin Ashraf, the Muslim chaplain at the University of Birmingham. The number of niqabis who are required to give evidence in court (pace the landmark ruling this week that witnesses had to remove the veil to give evidence) is minuscule; ditto, the number of doctors who wear a veil and won't ever remove it. (Williams, 2013c).
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