A NEW generation of Routemasters – known as “Son of Routemaster” is wheeling ahead, with the new version (pictured in a computer version) likely to be tested next Spring, and the first five prototypes due to arrive in London in 2012. Some critics have claimed the “hop-on, hop-off” hybrid vehicles, which were a key mayoral election pledge and are intended to replace the scrapped bendy buses, are a waste of money.