So, to prep for a 10k, probably better to get plenty of rest the night before and hydrate well and eat something fairly neutral and carb-based, and on the day, have a light breakfast and a good amount of water an hour or so before the race.
Do not have Peruvian chicken with a sauce made of more than a dozen chillis, and three bottles of wine to wash it down with and then just have a litre of espresso and painkillers for breakfast.
Was horribly dehydrated in what turned out to be a hot and muggy race, got serious calf cramps at 4k and had to sit down and rub legs. Went just over the hour mark as a result.
Disappointed with self.
On a more positive note, though, my children all did the fun run and had a super time. My elder son finished 16th overall.