Well I did it ...  just.  I came 4078th in a time of 4 hours, 36 minutes and 29 seconds.  I just beat my target time which was really pleasing since the weather was so hot.

Never again, though, but pleased to have managed it.  No injuries.  Back running today (Thursday) but not with any goal in mind.

Many thanks to everyone for their support and encouragement.

Joe