Joint strike action by tube power control staff extended a further week to 22 July as RMT hits out at flagrant breaches of safety.

Mick Cash RMT acting general secretary said

"This dispute is over an all-out attack on the power control grade that would hit pensions, length of service and working conditions and damage the futures of this key group of tube workers. Management’s claim that they can run the system without them is both provocative and dangerous.

We now have a catalogue of safety breaches compiled since the action began where critical inspections have been shelved and agreed procedures ripped up. That dossier has been sent to the safety authorities. We will not tolerate a situation where London Underground are literally winging it on safety to try and break the strike. We also know that fewer trains are running as the system teeters on the brink.

"If we are going to make any progress the management side need to get out of their trenches and engage with us in serious and meaningful negotiations. "