If by "end of Britain" you mean Agatha leaving the place, no way. She still has to meet with the Circus, Zeetha has to have her Bang showdown, Steelgarter's gonna pop back up, along with the Eyeball guy she talked to (no way he was one of the cultists who got killed), the Lantern's still out there somewhere, and then there's Albia's garden/shameful power source.
Or if you meant in-universe.. yeah, I'm assuming Albia's going to die before this is all over.