I have downloaded a copy of their rules, which give prohibited articles and advice. There is nothing about photography...
What did you download?
The LOCOG ticketing conditions are
here. The relevant bits are in the following extracts:
19.2.3 The following is a non-exhaustive list of restricted items which may not be taken into a Venue (LOCOG reserves the right to amend this list, generally, or in respect of any Venue or Session): food (save for baby food), alcoholic and non-alcoholic beverages (save for baby milk and other valid medical reasons), liquids in containers of greater than 100ml in size, needles (save as required for valid medical reasons), animals (save for assistance or guide dogs), weapons (including knives), illegal drugs, other illegal substances, fireworks, firecrackers, poles, flagpoles, sticks, large photographic equipment (including tripods), bats, large umbrellas and other blunt instruments, motorcycles, bicycles, roller-skates, skateboards, or other types of skates, electronic transmitting equipment, flags of countries not participating in the Games, large flags or banners, horns, whistles, drums, rattles, musical instruments, lasers or any other devices that in the opinion of LOCOG may disturb a Session, objects bearing trademarks or other kinds of promotional signs or messages (such as hats, T-shirts, bags, etc) which LOCOG believes are for promotional purposes, counterfeit products, balls, rackets, frisbees or similar objects, large quantities of coins, lighters, advertising or promotional material of any kind, printed matter bearing religious, political or offensive content or content contrary to public order and/or morality, bottles or containers made of glass or other material, flasks, thermoses, refrigerators, large objects such as suitcases or bags, and in general any material that LOCOG may deem dangerous or that may cause damage or disruption to a Session.
19.3.2 The following is an illustrative list of prohibited and restricted behaviour within any Venue: fighting, public drunkenness, smoking, gambling, unauthorised money collection, any activity related to marketing or advertising (including, for the avoidance of doubt individual or group ambush marketing), activity or protest related to unions, political or religious subjects, sale of goods by unauthorised individuals or in unauthorised places (booths, mobile fast food restaurants, refreshment areas, etc), unauthorised Ticket sales, unauthorised transmissions and/or recording through mobile telephones or other instruments (video cameras, tape recorders, etc), entry of unauthorised journalists/reporters with taping or recording equipment and/or video cameras, flash photography, attempting to access restricted areas, requesting money or other goods without authorisation (for example, musicians or singers at the entrance or in the Venue, charity collectors, beggars), standing on Ticketed seats, interfering with the operation of a Session (including, for certain Sessions, the use of mobile telephones), disturbing other Ticket Holders' enjoyment of a Session, disrupting the comfort or safety of other Ticket Holders and any other activity that LOCOG deems dangerous or inappropriate.
19.6.3 Images, video and sound recordings of the Games taken by a Ticket Holder cannot be used for any purpose other than for private and domestic purposes and a Ticket Holder may not license, broadcast or publish video and/or sound recordings, including on social networking websites and the internet more generally, and may not exploit images, video and/or sound recordings for commercial purposes under any circumstances, whether on the internet or otherwise, or make them available to third parties for commercial purposes.
So no tripods or flashes, and no "big" photographic equipment. Images can be "published" (e.g. shared on a forum), but video and sound recordings can't. That all seems fairly reasonable.
The key question for many people is how "big" is defined, which I hope to resolve definitively tonight.