I have had a lot more good runs lately and my calf pains while running that force me to walk seem to have almost gone. However, I was chatting to someone I know who is a "personal trainer" and he was recommending I switch to more cycling and less running (yes, right, like that is going to happen) and then he asked me what my warm up for running is. I told him, I walk for 5 minutes and he said that is what might be the problem..and went on to sueggest I do stretch and flex exercises and foam roll before running.
Like an idiot, I thought he might be an expert and tried it (don't have a foam roller but just massaged my calves)!
Result was a horrible painful run and only did 5k with quite a few walk breaks which was not my plan. I do stretch and flex on rest days not run days and I will be following my own advice in future. Unless runners have something to say, in which case always interested in learning