So cycling, yes we appear to be good at cycling. BMX'ing we're tipped to win another Gold. But why not have races in Brompton cycling? You'd have to unassemble your bike and get all your rucksacks & stuff together while leaping off a Tube train in the fastest possible time.
Tug of War? That would be a good sport to re-introduce. How many times have you seen people pulling their bags and cases from the lock tight closing doors on the Tube?
It takes Hurculean strength to open the doors when they're shut. I've seen some pretty strong commuters on the Tube doing this.
Strap Hanging or that gymnastic thing where you hang yourself from rings on the end of ropes. We'd be good at that.
We might even get some branded Olympic strap hangers like the ones London Annie saw in Beijing (pictured above)