They have unofficially stated the estimated extra distance, so the official times stand. At least it explains why I crossed the official 8 mile marker almost three minutes after my Garmin registered it. Also, if it had been short I'm sure the outcome would be less desirable! I've also discovered that the 4:30 pacer finished the race in a little over 4:17 - so I'm glad I didn't continue to follow him!
Given the problems at Stratford and Manchester, the little extra distance was a small price to pay for the event going ahead. I'm happy that I would have beaten my target had the conditions been kinder, and I'll train for a tougher target for next year.
I won't look at the weather forecast for your race. Every time I checked the MK forecast, it got progressively worse! Enjoy the carbo- loading.