Well advanced British \"Town\" predating Romans?

[Medicus matt]

Surely it's no surprise that a town that was home to the three sons of Commius (one of whom may even have been to Rome as a youth), all of whom seem to have looked to Rome as an inspiration and the Emperor as an ally (if not an overlord) might have been redesigned on a Roman pattern two or three generations before the Claudian invasion?
If it was going to be anywhere, it was going to be at Calleva.