Severe rush hour delays on Tube lines after signal system failure

The morning rush hour is off to a sticky start after severe disruption on the Tube (Picture: Getty Images)Commuters on the London Underground face severe travel delays this morning after a signal system crash.
The morning rush hour has been thrown into chaos after several Tube lines are suspended following a signal failure.
The worst-affected lines are the Circle, Hammersmith & City and Metropolitan lines.Travel on the entire Circle line has come to a halt after the system failure at Baker