Personal/private wireless access points and 3G hubs (smart devices such as Android phones, iPhone and tablets are permitted inside venues, but must not be used as wireless access points to connect multiple devices)
http://www.london2012.com/mm/Document/Documents/General/01/2...
They also seem to be following airline rules and have banned liquids over 100ml, amongst the other usual suspects.
I've no idea how they intend to enforce the ban against personal hotspots, nor why they'd bother in the first place. It's hardly enforceable, is it?
Edit: Interesting comment by ajerman on the engadget story, does this sound plausible?
I would have to assume it's less to be oppressive and more to just minimize excessive airwave congestion in the area. If a few hundred people are running a mobile hotspot, you're going to have quite a bit of traffic on the ole wifi frequencies.
http://www.engadget.com/2012/07/25/london-bans-mobile-hotspo...