Mayor Boris Johnson has been urged to 'get a grip' on Tube services after new figures showed an increase in delays.
Performance figures between January 9 and February 5 showed that the amount of time passengers were delayed on the underground increased by 26 per cent on the Jubilee Line, 18 per cent on the Victoria Line and rose by three per cent across the network, Labour said.
"Sadly these figures reflect the experience of millions of Londoners who use the Tube every day," Ken Livingstone, Labour's mayoral candidate, said.
"The frustration and inconvenience caused by Tube delays threatens to erode the every-day quality of life of millions of Londoners.
"The increasing delays on the Tube demonstrate that Boris Johnson hasn't got a grip, is out of touch and has failed to get on top of the detail of the transport system."
Transport for London (TfL) responded that the presentation of the figures was "completely wrong and highly selective" and that the number of delays had actually fallen.
"The current London Underground performance figures clearly show that the number of delays have fallen by around seven per cent," a TfL spokesperson said.
"The duration of incidents, which are often caused by passenger action or illness, or by other external factors, fluctuates from period to period and one month's data can not alone give an accurate picture of Tube performance.
"The reality is that all trends including reliability, delays, passenger numbers, and the number and frequency of services show that the performance of the Tube has improved significantly in recent years and continues to do so."