OK, I know it's all bull. But I care not. It's a fun read: don't read it because you think it might be the truth, read it because it's interesting, and to admire the amount of research they put in. (Even if it's half made up, making up stuff is not easy; ask any fiction author.) They're a bit too fond of two devices: the "there's no evidence for sausage rolls having been brought to us by aliens, but wouldn't it answer a lot of questions, eh?" and "it would take too long to enumerate the reasons but it's clear to us that the Alien/Sausage Roll conspiracy is well-founded in contemporary documents", but that's pretty common in this sort of book (Alternative 3 does it too).