Trini, if I'd known/thought about the drag effect of clothes I'd have worn cycling-type shorts instead of traditional-type running shorts. D'you think I could have save a few mins ? But seriously I'll think about several of your suggestions, - clothing, and keeping arms in etc next time i have to run in those sort of conditions.
And Vrap, if its any help, my HR yesterday was about what I'd have expected for a half marathon, though perhaps I could have pushed it up a bit earlier. There are certainly no variations that look like the difference between into the wind and with wind behind, though there is a big dip when the hailstones happened, and I was definately keeping my head down and not looking ahead, and at one point covering my face with my hand. I think a thick bushy beard would have been the most useful, as even if it had increased drag into the wind it would have been splendid protection from the hailstones :-)