Thought about this for a while and as I can remember,as a child,the weather always used to be much better after the summer holidays when I was back at school and this seems to be the norm in most years so why not hold the ugp in september rather than august?An end of year race for all.
Traditionalists will most likley say it has to be in august but the weather couldnt be much worse in september than it has been in august over the last few years.
Be interesting to see that in the last ten years,which was the dryest month