Cure 2: On the recommendation of greengolux I tried a Jaspar fforde which was great for malingering doldrums. It's apparently not science fiction, quite an acheivement for something that reads like somebody crossed five Cheapass Games* with Cold Comfort Farm, and perfect reading for pretentious English Literature graduates with a penchant for reading the New Scientist. You've been warned.
Cure 3: However, the most important thing I did was retrace a route I felt I had been mistaken in taking or had taken wrongly just over two weeks previously, since when, I've not felt entirely right. I retook it on Sunday and found queer pride grafitti, a boat with a confusing name, and a car in an entirely unexpected place. Sorted.
It's too hot to complain about the weather. For some quality ranting about the heat, check out la belle vie de Jonathan Larabie. I recommend 16 July.
*For reasons of simplicity I am counting Chrononauts as a Cheapass Game.