This is a very good account of Healyism. The "Party" recruited layers of youth and active trade unionists in small numbers and often with little political experience.
As a " machine" it mobilised them in some important and not so important struggles.
As you point out it was part Cult, part sect . Members were often forbidden to have contact with other people/ groups / liaisons or relationships. The internal party life was demanding and rigid.
The implosion in1985 was the most positive thing ever. Bravo to the small group of people - mainly women - who organised it.