Sometime on Monday my wife started to complain of a bite behind her knee. I couldn't see anything resembling a bite, but there was a bit of a rash, similar to hives. By Wednesday evening this had spread somewhat, and anti-histamines weren't cutting it. As she had to take her car for its MOT yesterday morning, I suggested she went by the pharmacy, an idea she rejected at the time. However, come the morning she evidently had a change of heart, as I got a text telling me she was at the minor injuries clinic (which, fortunately, is at Stoke Mandeville, only about 3 miles away), and could I call the garage to let them know she'd be late. She'd been directed to the clinic the by the pharmacist as our GP's practice said "not a chance" when she enquired (the surgery and pharmacy are in the same building)
Turns out that what she had was indeed a bite, and it's become infected - her calf was swollen to double it's usual size, hot to the touch and a not-so-healthy-pink, complete with a nice purple line drawn around it as a guide in case it got bigger. Oh, and a 7 day course of 4-a-day antibiotics. Seems a bit better today fortunately. No idea what the bite was from.