Jewish courts are in daily use in Britain, and have been for centuries.
British Jews, particularly the orthodox, will frequently turn to their own religious courts, the Beth Din, to resolve civil disputes, covering issues as diverse as business and divorce.
http://news.bbc.co.uk/2/hi/uk_news/7233040.stm
"When Chief Superintendent Steve Bending took over as Hackney borough commander in July 2009, tensions were already high between the Shomrim and police. "Under my predecessor, there was a lack of understanding by the police about why a community would want to have non-qualified people patrolling the area," Bending says. "There was also a lack of understanding by Shomrim of the legal processes we have to comply with."
https://www.thejc.com/life/meet-londons-strictly-orthodox-crime-busters-s6x9g74k