Until just a few years ago my mother taught English as foreign language in a secondary school and all of her students were Muslim and had arrived in Britain post primary school.
These children were adapting to British culture and also learning how to practice their faith in Britain. One of the difficulties of Ramadan for example, is that we have long daylight hours in Summer and school terms during Ramadan.
Another shock was learning to adopt the headscarf. These children complained that they didn't wear the veil at home, that their family back home would be horrified. They said that they were told by UK Muslims "you're in Britain now, in Britain we wear the Headscarf"
Where I live I see no more than half a dozen Muslim families wearing burkhas/headscarves/niqabs. I have no idea whether it is choice or oppression for the adults. But I am horrified by the tiny tots wearing a niqab. Some of the children in pushchairs are wearing niqabs for goodness sake.