This Jihad Watch report https://www.jihadwatch.org/2017/06/sweden-150000-women-undergo-fgm-authorities-admit-large-areas-under-islamic-rule on Muslim areas in Sweden is well worth a read.
This passage is of great interest:
'In many areas, self-appointed sharia police threaten and harass women to follow Islamic law, Sharia. Threats and harassment can be the consequence if you are not married, if your legs are not covered or if you drink a glass of alcohol on your balcony. Neighbors, strangers, even children and adolescents, threaten women to follow Sharia. If the women do not comply, the sharia police increase their intimidation. A woman tells how a group of men climbed into her apartment by using the drainage pipe and confronted her in her own home because she refused to comply to their demands.'
I wonder if there are any areas of the UK that operate similarly.