Last night, as I picked up my bike to set off home, I noticed a bit of play. I checked the headset, and it was fine, so I checked the front wheel (Nexus dynamo hub). It was very wobbly.
I took it out, noting that the tyre didn't get past the brake blocks as easy as i expected, and tightened the cones by hand. It's still rough, but not waggly (and it's replacement is ordered
). Then I saw the reason why the brakes were tricky - the new blocks (fitted last week) were coming out of the channel in the holder. So I took them out, refitted, and readjusted the cantis. Lovely braking now, even without allowing for the fact that the front rim is a bit out of true and I can't adjust the spoke nipples (long story; not my build).
This morning, I have oiled two chains.