I have a couple of answers to the discussion points.
1. The chip time you have is based on the "gun start time". This is to award medals to the first across the line and not necessarily the person with the fastest time.
The true time, i.e. based on when you crossed the wire at the start to when you crossed the wire at the finish, will be available later. If you started back from the front of the field, this time should be faster than that given on the day.
2. The course was measured by an official measurer at exactly 10k. Any device showing more than this could be based upon weaving in and out of other runners, starting behind the start line etc.
thanks to all you runners joggers and festive participants for taking part in the YMCA Harriers race. It was a fantastic spectacle with lots of money raised for charities. The weather could have been a lot worse. I hope you enjoyed the event. Congratulations to you all and we hope to see you next year.