Terra Nostra is a strange group started by Blakes 7 fans - apparently the Terra Nostra were some sort of terrorist/mob group on the show. The members are strange, strange sci-fi addicted fans who meet at least once a month. Normally in Horsham.

And I think I read the first few lines of the first one he posted on UCSL, went 'eeek!' and dived for the delete button.