There are few notable examples of fortified stone walls in Celtic and Germanic areas. Palisade does seem to be the most common form, if the archaeology is to tell us anything.
And the introduction of Germanic paganism is indeed a strong element, if the funerary traditions are anything to go by.
And Plotinus, it must be noted that, at least in the 11th century in Ireland, the church had deviated to such an extent that the papcy had to appoint a continental Archbishop in Britain {Canterbury?} (where clergy went to be ordained, curiously, rather than in Armagh) to keep their practices in line with Rome.
As for the issue on London, thank you! I wasn't aware of that; my knowledge of London isn't that great
I assumed, perhaps rashly, that the existance of a church equalled the existance of a populace; but you're right, they are exclusive 
And the introduction of Germanic paganism is indeed a strong element, if the funerary traditions are anything to go by.
And Plotinus, it must be noted that, at least in the 11th century in Ireland, the church had deviated to such an extent that the papcy had to appoint a continental Archbishop in Britain {Canterbury?} (where clergy went to be ordained, curiously, rather than in Armagh) to keep their practices in line with Rome.
As for the issue on London, thank you! I wasn't aware of that; my knowledge of London isn't that great

