Thanks everyone. I'm going to try Up & Running and see what they can suggest.
I got back from the GP this morning and he said i've sprained my knee quite badly so no running for me for the next two weeks. I can only swim - not great when you're trying to train for a half marathon! He was confident I could still do this however but i'm now concerned about my fitness/stamina.
Got back from the GP today who said it's not ligament damage but a sprain to the knee joint which is causing pain down both sides of my calves.
Does this sound right? He gave me a self referrel form to see a physio so I've now sent that off but could be waiting up to 8 weeks. He said to rest for another 2 weeks with no running,only swimming. He was confident I could still do the half marathon.
I've followed it as best I can. I work at a desk mostly during the day so i've been trying to keep it on a foot stool and obviously have a tube bandage at home.
I was thinking of maybe investing in a knee support but some advice off one of my friend who is an experianced runner put me off - she suggested I might rely too much on my other knee which isn't damaged thus causing more problems.