Well I followed the advice posted by various bloggers on this site (as well as Laura) and focused on using a slow jog rather than worrying about my pace. With an end result of - yippee I did it!!!
As others have said, weeks ago I felt chuffed just by being able to run/jog for 60 seconds but now I can do 5 minutes. OK, there was a couple of sections where my jogging pace was almost the same as my walking pace but I kept up the running action which apparently important for training your muscles. Also it would have taken me 45 minutes to complete 5k but do you know what: I can see the light at the end of the tunnel.
Oh, and I got soaked but even that feels great. Have a good run everyone.