Jason - you beat me to it
I was just about to post that drink stations should be around every 3 miles
I did Silverstone HM back in March and it was a surprising very hot day and I seriously dont think I would have made it without the 4 drink stations 
Your forecast sounds ideal, I second it 
Craig - thanks for the info
Am hoping to get out this weekend and do a long run, its been a while
just to put my mind at rest that I can actually do it
haha
Have a lovely long weekend everyone 