The Aftermath Campaign
Sometime around 2000, I ran a campaign set after the end of the main campaign, SAVE and NWI had collapsed and the Left and Right Hand Paths were no more. It focused on the fate of the powerful characters from the main campaign. It mixed in a number of characters from various different earlier groups. I believe Dr Martin Everage and Ian Smith were definitely involved, as well as possibly John Singing-Rock.
John Mathews
John Mathews was in an asylum run by a Doctor Van Dyson, who used to care for mentally damaged members of SAVE, but since SAVE's fall had started his own crazy experiments. Vab Dyson had some powerful suggestion abilities that were difficult to overcome. In the end, the spirits of several former SAVE agents who had been betrayed and killed by Van Dyson drove him insane, with the party's help. They were too late to save John Mathews though, who was lobotomised by Van Dyson.
Frank Kings
Frank Kings had turned into a vampire lord in London. He had got himself a nuclear bomb, as a way to fuel his pyrokinesis powers to the maximum. He was crazy at this point.
Nick Kellend was also a Vampire, blood-bound to Frank but knew he was crazy and anonymously helped the party, in a "deep throat" way. Nick gave the party clues and directing them to save Chandler, a vampire rival of Frank's. Chandler was a difficult ally, but ultimately he helped the group stop Frank from destroying London.
Those plots I remember from this campaign. There were other stories, but I do not remember any more and there are no notes.