I'm not getting this. The whole Paxman interview banging on about how many illegal immigrants there are seemed daft. How is a Prime Minister supposed to know something like that? It almost seems unknowable (I'm not convinced by what little I've picked up from the method used now - from the Channel 4 News report this evening, it seemed to start from the premise that illegals will have declared themselves as foreign born in the census?). Now Blair's done the reasonable thing and asked for an informed estimate, he is accused of being coy or lying.