On a very obvious note, places like London Bridge, Westminster, Big Ben Bridge, these are most flooded area, with tourists, our leaders or the regular users. Terror attacks have put the London city as a scariest and unsafer city for people of UK.
Few basic steps like putting safety nets besides Bridges, which can prevent people from falling to the river and still be alive;
Other steps like ensuring the footpaths are used for pedestrians and not for any lunatics to drive over the public, to avoid somebody to easily stroll in their wheels be avoided, by initializing strong iron barrier system (for example : http://www.mdhguvenlik.com/mantar-bariyer-sistemleri/), which avoids any four wheeler to randomnly drive over.
You are already doing a good job. These are few of my comments for the safety, i believe these small things can make a lot of difference. Hoping to see any improvements.