So it wasn't far or fast but I managed to run for 10 minutes and my calf has survived. It was such a glorious morning that I couldn't resist - and it has been very nearly 3 weeks of resting since my last attempt.
I must have looked a sight mincing along with fairy footsteps - and because of my peculiar gait my good leg started to complain - but who cares. I'm back in the game!