Wiggins breaks Boardman’s UCI hour record on BMC velodrome (almost)

That would have been the headline if all weather conditions where right and Wiggins ignored his fans and went to higher altitudes for his attempt. Now, the internet is buzzing with the story about how he would have reached 55 km during his one hour on the cycling track if the atmospheric pressure wasn’t that high in London. So what’s all this fuzz about? And where does the numbers come from? So if things were as optimal as possible, what would be the new UCI hour record?