Tottenham Court Road and Gower Street are amongst the worst polluted streets in the UK, and Oxford Street is one of the most polluted streets in the world. A major contributor to this is widely acknowledged as being emissions from the engines of buses, including the new Routemaster. It is an offence under The Road Traffic (Vehicle Emissions) Regulations 1986 for vehicles to be left with engines idling unnecessarily whilst stationary. It is also a requirement of Regulation 88 of the Road Vehicles (Construction and Use) Regulations 1986, as amended, that drivers switch off engines in parked vehicles. Indeed, it is a TfL requirement that all buses parked at stands should do so with their engines turned off. However, there are very frequently buses on the route 29 stand on Gower Street (south of Bedford Square) on the 8/134 stand on Tottenham Court Road and on the 176 stand on Great Russell St parked with their engines running. Will you ask TfL to ensure that bus drivers are aware of the requirements governing parking on bus stands and identify who is responsible for enforcement of this at TfL?