It was a crazy headwind when I rode it last September (or October, can't remember now). Had to push so hard to the turn I was within a whisker of blowing up. Absolutely flew back. Despite the wind I got a new PB.
Punctured before even left London, sealant kind of worked, but walked 2 mins to Hub Velo, they were champions but couldn't quite get it to seal and ran out of time for the train. Really gutted as fancied it today.
Then smash the out. If there is a tailwind it'll be silly fast back.
Stop in a lay by on the way there and see what it feels like.