Ride London 100

Also wondering about this, would love to do the ride but didn't get a place. Can they really marshall a 100 mile stretch of road to check riders are all properly registered. How could they get you off if you're not, rugby tackle you?

I'm not riding it properly, but this takes place along most of the route I have to ride to work, on a day that I'm working. There's not many other options as far as routes go.

Would it be bad form/etiquette to tag along with the ride for a stretch?