I know that if when it comes time to repoint, I should get the current mortar analyzed to make sure its curing strength is compatible with the old bricks. I know that brick foundations in the time period of this house were often plastered on the inside both for appearance and to help maintain appropriate moisture levels in the mortar.
What I don't know is how to tell whether/when/how often repointing/replastering is needed.
(I'd like to insulate the basement. But I'm worried about blocking maintenance access. At least the workshop area is in the extension, and hence is a straight concrete foundation; I know what to do with that.)