Last-ditch talks aimed at stopping strikes on the London Underground will be held later today.
Members of the Rail, Maritime and Transport union (RMT) and the Transport Salaried Staffs Association are due to walk out for 48 hours from 9pm on Tuesday, in a row over ticket office closures.
Transport for London (TFL) has warned travellers all tube lines will face serious disruption if the two sides fail to reach an agreement.
The RMT confirmed it’s willing to talk directly with Boris Johnson, but the London mayor said he will only meet if the strike action is dropped.
Talks will resume this morning at the dispute resolution service Acas following unsuccessful attempts last week.
London mayor Boris Johnson has accused RMT union leader Bob Crow of “disrupting the lives” of millions” of travellers.
In his weekly column for the Daily Telegraph Johnson dismissed the action over ticket closures as “politically-motivated muscle-flexing” by union bosses.
Johnson also spoke out against Crow after pictures appeared in the press of the union leader on holiday in Brazil.
“I love a beach holiday myself; like Bob, I have some groovy swimwear that doesn't always meet with acclaim; and I consider it the right of every freeborn Englishman to drink a bottle of wine and turn the colour of a lobster in the sun. Bob Crow is entitled to his holiday," Johnson wrote.
"What he should certainly not be able to do, in my view, is prepare to disrupt the lives of millions of people who are not on holiday but who want to work; indeed, who need to get to work tomorrow to earn the bread for themselves and their families - the bread that will allow them to pay for a holiday of a kind that Bob has been enjoying."
In a statement TFL said: "Should the RMT and TSSA strike action go ahead, London Underground will keep as many stations open and run as many trains as possible.
"Services will be affected from 9.30pm on Tuesday February 4 so customers are asked to try to complete journeys as early as possible that evening.
"If your Oyster card needs topping up, it may help to do this in advance of the industrial action starting.
"There will be disruption to journeys on Wednesday and Thursday, when Tube services will start later and finish earlier than normal - trains will run from around 7am to 11pm."