A trawl through the newspaper archives give the last activity in 1991 so I imagine like many of these diaspora societies it dwindled as members aged, 2nd generations "naturalised" and new expatriates didn't replace them. Notably much more reporting about it in Yorkshire than Edinburgh papers
Monty Python: Four Yorkshiremen - They Won't Believe YouALT: Monty Python: Four Yorkshiremen - They Won't Believe Youstatic.klipy.com