After posting about Ravenglass, I looked up more about it on the web. (Yes, probably I should have done that before posting, but I reserve the right to blether.) I discovered that it used to be called Glannaventa, and that it was garrisoned by, first, the Aelian Fleet, and, later, by a rather dim-sounding lot of auxiliaries called the Moroni. I also discovered that it claims to be the tallest surviving Roman building in England.
We have a Roman fort here in Coventry, which I now designate the tallest Roman military building in the south-central West Midlands. The bank must be a few feet high.