This however, would still fall under Anachronism Stew, as that movie was set at least 28 Weeks (or 6 months) after the outbreak, even if both the movie and series were released in 2007. However, it could also be obtained from supply drops, but with a "care package" equivalent of donated toys sent to destitute communities.
Unlike the other Infected variants, the Alphas are shown to universally prefer killing their victims by ripping their heads off, rather than infecting them and letting them turn. This provides a neat explanation for why Alphas are relatively so much rarer than the other Infected variants, the Fast Ones and the Slow-Lows, in the movie; since the variants being strain-based means that logically, only people infected by an Alpha's strain of the Rage virus will turn into Alphas themselves, and every and anyone infected by an Alpha would presumably turn into an Alpha as well.
With the above in mind, Alphas' preference to kill over infecting new people themselves might in itself also be a conscious tactic on their part to avoid creating new Alphas whom might rival, challenge or compete with them for territory, food or Fast One followers.
Aside from the Alternate History of Jimmy Saville's scandals not being exposed due to the Rage Virus Outbreak happening in 2002 - or at the least not known in infected Britain - along with Jimmy Crystal being too young at the time, another draw for the cult would have been the "Jim'll Fix It" show title that evoked a sense that their perceived version of Jimmy Saville would fix the outbreak.
Knowing what's to come, this means that between Spike desperately accepting Sir Jimmy Crystal's offer to help (when refusing would likely have meant his death to the Infected) and then shaking his hand in the aftermath is truly a Deal with the Devil (but in a metaphorical sense).
On another note regarding Samson possibly being the father of Baby Isla, he seems really hell-bent on getting his child throughout the latter half of the film... but there's no telling what would happen if ever he did manage to get ahold of Baby Isla, since she's notably not infected, and as we've seen throughout the franchise, even children aren't safe from being brutally and savagely killed by the infected. Who's to say that Baby Isla being his own child would actually stop Samson from sadistically murdering her? This seems even more likely after the sequel revealed that the Rage virus drives Samson to attack by making him suffer a psychosis where he hallucinates anyone — including babies — who isn't displaying Rage symptoms as an absolute monster.
The island's casual use of exaggerated masks, exaggerated stories of infected, and such a young, terrifying coming-of-age ritual hint at a plot to make its new citizens absolutely terrified of infected. However, looking at Kelson's and Jimmy's struggles, the infected don't seem to be as dangerous as the island's adults make them seem. This fear tactic would be effective at keeping them on the island, and under their control.
It's also possible that the islanders genuinely believe the Infected are more dangerous than they are in reality, especially given how large the island's graveyard is. Everyone not born there probably watched all their loved ones either die or turn — the younger adults, like Jamie and Isla, would have been children surviving the loss of everyone they knew (who might well have also tried to kill them). The entire adult population probably has untreated PTSD.
Really, on a rewatch, the island seems...a little off. Yes, it's the sort of world where you have to be tough and make hard decisions, and a strong sense of community would be important. But the flipside is that it's resulted in a deeply conservative, closed-off world: despite Jamie's acknowledgment of other settlements, they don't seem at all interested in even trying to establish contact or links that could be mutually beneficial (Jamie claims that none of them have anything the island doesn't have, but the island doesn't even have a doctor), and regardless of his own feelings on it, Spike says he can't turn back once they've left because "everyone will think [he's] soft". Rather than reassuring him, Jamie laughs and agrees.
There appear to be no non-white people on the island. Just a coincidence, or is it a subtle mark of something more sinister?
