U.K. cycle rules posted this today. Sorry if repost but didn't see it upthread.
Conclusions
So, to summarise, riding in a games lane during its hours of operation is likely to amount to an offence of breaching a Traffic Regulation Order. If you commit this offence you can be given a fixed penalty notice of £30, by a constable in uniform. Alternatively, if you’re convicted in court, you can be fined up to £5,000.
But I haven’t been able to find any legal basis for any other kind of fine for a cyclist for riding in a Games lane.
U.K. cycle rules posted this today. Sorry if repost but didn't see it upthread.
Conclusions
So, to summarise, riding in a games lane during its hours of operation is likely to amount to an offence of breaching a Traffic Regulation Order.
If you commit this offence you can be given a fixed penalty notice of £30, by a constable in uniform. Alternatively, if you’re convicted in court, you can be fined up to £5,000.
But I haven’t been able to find any legal basis for any other kind of fine for a cyclist for riding in a Games lane.
the tl;dr version is here:
http://ukcyclerules.com/2012/07/27/fines-cycling-olympic-games-lanes/