Blocking Skype

While my brother was in the U.K., he found that Skype on the N900 was blocked on every wifi hotspot that he tried. Not just a few hotspots blocked Skype, but every single one, even in his hotel. It's very strange because the nothing in my research that indicates that anyone in the U.K. blocks Skype on wifi hotspots. It's supposed to work.

On the other hand, in Canada and the U.S., Skype hasn't been blocked at any wifi hotspot, the exact opposite condition as in the U.K. Draw your own conclusions.