An inquiry into the service London buses provide is taking place

The London Assembly says in 2001/2 11,631 complaints were made, but in 2004/5 the number had risen to just over 43,000.

Transport for London (TfL) blames the rise on the systems for reporting problems being made easier to use.

An inquiry by the Assembly into bus driving standards and passenger experiences starts on Thursday.

Roger Evans, chairman of the Assembly's transport committee, told BBC News: "There's been quite a lot of improvements made to the bus network over the last few years.

"But one of the things that we get a lot of complaints about is the standard of driving, buses braking too fast, cornering too fast, a lack of consideration for passengers and it's something we all want to do something about.

"It's particularly bad for people who are elderly or a bit unsteady on their feet because a lot of the buses' seats have been removed to make some space for wheelchair users so the opportunity to sit down isn't always there."