the Young Knives, both nights were sold out, so ticket sales can't have been to blame as both nights were sold out.
Personally I felt that the band might have been getting too big for their boots, and thought that these gigs might have been beneath them not that they become a 'biger' band

Erm, so it doesn't add up that he was feeling ill at Jools Holland and felt worse the next day, hence the late notice on the cancellations?

That doesn't make sense. Rostam felt ill on Tuesday, recorded for Jools Holland, felt worse the next day cancelled the gigs. Rest of the band were bored, went to the NME awards, Chris got run over. I think they were waiting until today to decide if Rostam was well enough to play, then Chris' accident put paid to that. It's pretty simple! There isn't always another story.