Some thorough rim and tyre inspection, followed by refitting the rear wheel with a nice new tube (I'd forgotten how much easier it is when you can feel your fingers), after yesterday's puncture fiasco.
Since I had to dry out the contents of my emergency toolkit, I took the opportunity to restock it a bit, including a bit of nice fresh sandpaper, seeing as we seem to have a mysterious surplus of the stuff.
This took all of about 20 minutes, including the time taken to track down the presta-schrader adaptor which ran off and was in dire peril of being eaten by the sofabed. I have been utterly exhausted since. Bloody lurgy.