Looking for title/author of a 60's-70's novel of near future dystopian UK. It featured a family beset by "yobs" - that was the term actually used in the book. Yob culture was ascendant. There was a motorcycle gang that took over a young woman's family's house, and the novel ended with fundamentalists organizing throughout the country, fighting back and winning. Any ideas?
Also just remembered the fundamentalists dressed in robes like monks.