i read a lot about british history and this period is my favourite...all i have to say is that you have forgotten the romano-british people. consult the blood tests done in britain and you will notice heavy germanic blood on the edges of the island.....of course there is also the religion, anglo-saxons converted to catholicism and drew the romano-british church out of the land.
I don't know what you mean by "heavy Germanic blood" - it was the Anglo-Saxons, not the Romano-British, who were Germanic if anything. The Romano-British church was "driven out" before the Anglo-Saxons converted to Catholicism - it was basically destroyed when the Anglo-Saxons first appeared, and replaced by paganism. However, I think it is a mistake to describe the religious disagreements of this period as disagreements between "churches". To talk about "Catholicism" implies that there was any alternative. There wasn't. Certainly the Celtic churches did some things a bit differently from those in closer touch with Rome, but that didn't mean they weren't "Catholic" or that there was some kind of purge of them, as you imply.
Also, almost nothing is known about the British church before the time of the Anglo-Saxons, beyond its bare existence. We don't know how many people were Christians or what form their Christianity took. Given that the advent of the Anglo-Saxons saw Christianity apparently wiped completely away and replaced by paganism (a very rare occurrence), it seems reasonable to think that Romano-British Christianity was a minority affair and not very strong.
the people of britain stood their ground, under pressure from church and upper society they were forced into assimilation. to claim that towns were deserted in an era where tens of villages gathered under the protective walls of city fortifications seems fancy....
But they didn't do that. Anglo-Saxon villages were certainly fortified, at least sometimes, but these were not substantial city walls, they were usually wooden and earthen palisades.
And, Plotinus, the Anglo-Saxons were certainly in London in the 7th Century; my source is below
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See the Burlington Magazine for Connisseurs, Vol. 79, No. 464, Nov., 1941
Very nice source! But it's only talking about the church of All Hallows By The Tower. That is certainly within the Roman city of London, but it was built and maintained by Barking Abbey, which was very definitely outside the city. Presumably that indicates that things were going on in the Roman city, but I'm not sure it proves that anyone was actually living there.
The real centre of activity in Anglo-Saxon London was of course Aldwych, to the west of the Roman city. At that time it was called Lundenwic (London town), and later became known as Aldwych (old town) when people gradually moved back into the Roman city (which, paradoxically, they thought of as newer).
There's an interesting brief overview of the nature of Anglo-Saxon settlements
here. As it makes clear, "towns" and "cities" in the Roman sense didn't exist in Anglo-Saxon culture, which thought of (and created) settlements in a very different way.