The W3 bus is the most complained about bus route in London and a Haringey MP is on a mission to improve it.

The bus, which runs from Finsbury Park to Northumberland Park, received eight complaints per 100,000 journeys from customers in November 2011.

The latest figures, which were released by Boris Johnson at a London Assembly meeting in City Hall are far higher than the average two complaints received per 100,000 bus journeys taken in November.

The complaints centred on the unreliability of the W3 bus and the over-crowded nature of the route.

Lynne Featherstone, MP for Hornsey and Wood Green, approached Transport for London (TfL) two weeks ago, asking the transport provider to address the issues seemingly plaguing the W3 bus route.

The company apologised for the reliability problems, which they say was largely caused by engineering problems.

The company said they introduced a new operating schedule for the bus route at the end of January to overcome some of the issues and, according to TfL, newer buses will also be introduced over the next few weeks.

The Liberal Democrat MP has pledged to see that the improvements are made, and will survey bus users in the coming weeks to see if commuters are impressed by any changes made by the transport company.

The surveys will be included in leaflets handed out by the MP, and she will also survey W3 passengers at bus stops in the run up to Easter.

She said: “With many people locally being completely reliant on the W3 bus to get to work, school or out and about, an unreliable service and overcrowded buses can mean a very bad start or end to a day, and worst case scenario leave people stranded.

“It’s essential that TfL works with the bus operators to address any reliability and overcrowding problems, and I am glad to hear that recent steps have been taken by replace old buses and resolve engineering problems.”

The average number of London-wide bus complaints has fallen very slightly over the last few years. In 2009-2010 there were 2.62 complaints per 100,000, which fell to 2.39 in 2010-2011.