Hello there! Marcus here, and I've just been to see the lovely people at ActiveSportsTherapy.

After some discussion of the absurdity of Fridge travel, I was made to do some excercises and stretches that made me look like an idiot, and the problem with the knee was (finally) diagnosed.  Basically, my feet are not quite as they should be, and whenever I take a step my foots rolls too far to the outside, making my knee move in weird directions.  This occuring every step multiplied by 1000 miles eventually became too much and the pain began.

But never fear!  I was taken down into the gym and given a whole bunch of excercises to do so I can now look like a fool 15 times a day!  I was also given ten minutes of a muscle stimulating machine which was great fun to ramp up to as high as I could stand and watch my legs quiver.

The official verdict is that I'll easily be up and walking again for the first week of December, provided I do the silly excercises.