Liversedge lesley2 - try different socks and check your shoes. Did you get any blisters during training? As it was hot, did your feet get sweatier than normal or wet with water? That can cause blisters when you've never had them before because the moisture makes the skin softer and more prone to blistering.
On the double posts. It happens on my android phone too. Don't refresh the forum page, but go back to the followed threads or your bookmarks and reload the page. It takes longer but saves you from repeating yourself
Thanks all. London rocked today!!! Time was irrelevant for me as was pacing/prodding a friend around to a sub6 but I loved it! Had masses of time to soak up the atmosphere and enjoy the ride. I freakin' love this town!