Ditto...I ran a time of 5hrs 4 minutes at London- disapoointed with my time as I wanted 4:48 (11 minute miles)...I was ok until about mile 20.
However, I really didn't know what to expect from mile 20 as this is the furthest I had gone in training. I really wish I had done a few more 20 milers and perhaps a 22 miler to make me stronger. I can blame the heat...but to be honest I think it was more likely under training as physically i felt fine all the way around...no real niggles and I wasn't too dehydrated at the end. I drank at every water station.
So...yes..I will enter the ballot again but as I will be very lucky to get in twice I may enter Brighton. I will tweek my training to allow for extra long runs and next time I will have a better idea about how far 26 miles really is. Incidently, my Garmin clocked a mileage of 26.55 miles !
I'm tempted to look for a late Autumn marathon somewhere.