So yesterday I went to see the physio. This is a first for me. Lovely bloke. First he looked at the front of my legs then the back and repeated a couple of times. Then he had a look at my knee. Bent my leg, stretched it, poked and prodded my knee and generally caused pain and discomfort.
Anyway the good news is is that it isn't anything too major. Apparently I have torn my medial collateral ligament. This is also linked to the fact I have tight hamstrings and calf muscles and overpronation of my left ankle. The physio has given me some exercises to do to stretch my muscles and some felt to put in my running shoes. He advised caution when I talked about gait analysis.
The good news is that he said I could try running from middle of next week but suggested I took it easy and started off with run/walk sessions.