LONDON is set to be paralysed by its second Tube strike in a month after drivers slammed “pig-headed” Mayor Boris Johnson for refusing to postpone all-night services to find a settlement.

Drivers’ union Aslef and engineers and power staff in Unite said yesterday that they had rejected a new pay deal.

The two unions are due to strike alongside white-collar union TSSA and the blue-collar RMT for 24 hours from 9.30pm tomorrow.

Mr Johnson suggested last month that his plans to start Friday and Saturday night running could be postponed, but now bosses insist that rosters will be issued this week for a September 12 start.

Workers say the plans will cause a “body-clock nightmare.”

Aslef organiser Finn Brennan said: “The main concern is the complete lack of firm commitments on work-life balance for train drivers.

“We genuinely regret the disruption [the strike] will cause.

“But the blame for this must rest with the pig-headed determination of the mayor to insist on a September 12 launch of Night Tube instead of allowing more time for a negotiated settlement to be reached.”

The deal on offer includes a pay rise of 1 per cent plus £500 this year, a rise of 1.7 to 3.3 per cent depending on grade.

The rise for the two following years would be in line with inflation, with a minimum of 1 per cent.

During talks, Transport for London bosses have refused to raise the value of the offer but said it could be “reshaped” over concerns about work-life balance.

One driver, writing on the Aslef Shrugged blog, said that drivers had been promised that proposed rosters which would allow for three consecutive late shifts followed by two weekend night shifts and normal working on Monday would only be temporary.

But he said that staff “will be stuck with these shifts for the rest of our working lives.”

The warning came as Transport for London awarded a £760 million contract for modernising signalling and train control on London Underground’s Circle, District, Metropolitan and Hammersmith & City lines.

But Labour’s London Assembly transport spokeswoman Val Shawcross said the plans would leave passengers “with yet another five years of overstretched services.”

And RMT leader Mick Cash said the plans were “wholly at odds” with cuts elsewhere on the network.