So: today. Felt much better first thing (slept in slightly). Managed about 3 hours paid work all in, realised I didn't have the concentration to keep on with it, went back to prodding the calendar.
Heatstroke seems to have morphed into a stomach bug - I seem to have this knack of getting illnesses in pairs - and I'm feeling somewhat wiped out and asocial.
Should probably get some more paid hours in this weekend, but might head up to Cambs tomorrow instead to see the parents briefly.
Hope I get over this soon, it's bloody boring.