Thanks, lisah and Laura!
I came to post that after David's post last night I went down the freaking rabbit hole about balance tests, etc. Hilarious. Self-diagnosis - basically fine, with some residual catching up still to be done from my right ankle, which I broke about a year ago. And I intend to add some easy balance exercises into the (non-existent) daily routine.
Why do I do better with routines yet also often hate them? A question for the ages.