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Thanks rdl6989, umgud, and TXnMA! These are in addition to the Vindolanda tablets, which were dug up from one of the old forts along Hadrian's Wall.

Irrelevant sidebar -- in the past couple of weeks, I was told (in person, not on the internet, weird, eh?) some howlers about how the "Scots" (that is, the pre-Scottish, Roman-era inhabitants of Roman-era Caledonia, which is now basically Scotland) managed to fight off the Romans. Such tales are clearly imaginary in origin. Caledonia had nothing of much value, and there were serious concerns to deal with on the continent.

Also, there's a so-far-unexcavated site north of Dublin, Ireland, which appears to have been a Roman fortified settlement, probably a trading post and method of communication with the local tribes, similar to what the Romans did on other of their frontiers. Surviving information from the Romans implies that there was at least a Julius-Caesar-like reconn-in-force in Ireland during the 1st century.