Well after spending the last 48 hours reading up on running techniques and painful calves. I thought I would try a different pair of trainers. I drank a pint of water 30 mins ago and then setup up the c25k app and pressed play! up to that point all was well.....
I got to 10 mins. I think it was the 2nd run and my left calf just was so painful, this time I thought I have to stop. so just sat down and touched the back of my left calf and it is very warm, my right calf seems fine.
I am going to leave it for the time being and just go back to doing my 10000 steps and try to build up some core strength.