Its always hard to calculate this one as there are so many people whose improvment this year is still outside their best.
Whilst I go and make another drink, I'll leave you with a couple of stats that are by-products of my research.
Including this year's debutants, there are 371 people who have completed a single lap of the course.
In the history of the event there have been 397 personal best performances.
Coming up next - how many of those 397 were set this year.