I tried to respond earlier, but think that I failed to post correctly.
I agree, Mildorado. As part of my my secondary middle management post (PTC in a Scottish secondary) I was involved in primary liaison.
Latterly, I was seeing a tiny number of primary girls wearing scarves. (There were very few children of colour in our catchment and only a small number of Muslims.) [ETA Yes - anyone can be a Muslim, but there are hardly any white Muslim women in my part of Scotland. I do recall that we had two siblings whose white Scottish dad had converted prior to marrying.]
At one point, no Muslim girls wore scarves to school, but we have a small number wearing them to secondary now.
We had a situation one time where a father - an Iman in a town at the other end of the county, apparently - wanted to enrol his two daughters at our school. However, he told our HT that his daughters WOULD be wearing a full niqab to school. (I wasn't present at the admissions meeting, but the HT had a conversation with me afterwards.)
Our HT told the father that they would not: uniform was mandatory, but they were welcome to wear scarves with the uniform. The father chose not to enrol them.
I'm assuming that he came to us because he'd already tried all 4 secondary schools in the town where they actually lived.