"Bicycles will be removed" - legal?

What we need is more of those clever bike stands that clamp round street furniture retrospectively. I wish I had invented them.
these:

I briefly met the guy who invented these during last summer in Herne Hill, as he was training at one of the monday night sessions, very nice and friendly guy, I don't remember if he's on the forum or not, I think I'm correct to say he joined one of the bridges rides last august.

http://www.cyclehoop.com/

I'll email him if he has not seen that thread, maybe he could contribute here... He he has already and I have not recognized the forum name, apologies!

Szia

Loic