thanks, I got up and out. Much cooler this morning. I found it a lot easier, even managing to speed up a little when I guessed I was on the final 2 minutes of the second run.
Although in retrospect perhaps the final brisk walk could have been a bit, well brisker! It wasn't even as though I felt I needed to slow down that much.
I have been meaning to try running on grass so went across to a meadow with ploughed paths but it was hard going (and there were too many bugs) so I went back to the park after one lap.