Incomplete info Mark!
They were Vercingetorix in series 2, 3 and 4 (as well as the southern annialator), then changed to Comengetorix in extreme 1. They did not appear in series 5 or 7, but reached round 2 of heat J in series 6, losing to Hydra.

As for Killertron , I dont know, but you claim to be in contact with them!