good grief - REST your poor knee. you reported it was very sore yesterday, but STILL tried to run on it today.
Brain really wasn't switched on in the morning... so instead of walking to bus stop and doing work-lunch-shopping en route, I went out to do it at lunch time, but locked myself out of the office, then had to get a GoGet to drive to my colleague's house to borrow a key to.... you know that kind of day.