Okay, so I'm working on a TL, and I have it mostly kinda figured out. It does have a bit of wanking when it comes to Celtic culture in the British isles, but I'd like to say that it's mostly plausible.
Thing is, it needs a good point of divergence. I know that the Anglo-Saxons were taking advantage of the power vacuum the Romans left behind when they left Britain, so what would have to happen to make them think it wasn't worth it/not consider it in the first place/decide it wasn't a very good idea?