Well, we are all prone to sunlight deficiency in the UK. A friend in Canada has just bought a special light, also available from amazon here, which is meant to counteract this effect, though I suspect it is bunkum in this instance. Do we have evidence of burqa wearers suffering from a deficiency which other fully clothed wearers do not? After all, it is only the skin on the face which is being covered. But it is a reason for those who are against the burqa to seize on, regardless of any peer reviewed evidence, isn't it ? Better than saying it is not British ! The turban and the yarmulke aren't "British" either, are they?
Unless the mini-skirt wearer is not wearing tights in our weather, she is not exposing skin either.
Let's be honest. People object to the burqa because it is a sign of oppression, or because someone following what they believe to be a religious or cultural necessity stands out as being not Christian and/or not one of us. Not British indeed ! Why they object on the second ground when they have no objection to the Sikh turban or the yarmulke or orthodox Jews in Stamford Hill dressed as they think their religion requires, is not explained.