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As another 24 hour tube strike causes major problems for Londoners, union leaders are urging the Prime Minister to get involved.
The heads of the RMT and TSSA have written to David Cameron asking him to organise urgent talks to try and sort out the row over 800 job losses.
Speaking to London's Heart at the Tory Party Conference in Birmingham, Boris Johnson has dismissed calls for the Prime Minister to convene talks.
The Mayor's exclusively told us that Bob Crow and Gerry Doherty's letter to Mr Cameron is an attempt to embroil the coalition government in the dispute which could otherwise be easily resolved.
He's also called for a change in the law on strikes so at least 50 per cent of union members would have to be balloted before industrial action was allowed.
The 24-hour tube strike won't officially end until 7pm on Monday evening, but Londoners are being told to expect some disruption until Tuesday morning.
TfL says it's running as many Tube services as it can but has urged commuters to use alternative routes and modes of transport if possible.
London Underground will run as many stations as possible, but disruption is likely on most journeys.
Extra buses will be used on key routes to boost the capacity.
DLR, London Overground and Tramlink
Expected to operate as normal. Some stations where there is an interchange with the Tube may be affected.
Rail services are expected to run as normal and accept Pay As You Go Oyster cards.
Larger boats are being used to increase capacity on the river services. An additional 500 capacity shuttle service is also being provided between Tower, Westminster and London Eye Piers, which will operate 06.30 - 10.00 and 16.00 - 20.00 on Tuesday 7 September.
London Cycle Hire Scheme bikes will be available, but demand is expected to be high and bikes may be harder to find during the rush hour. Bikes can be left easily at the cycle parks at Finsbury Park and London Bridge.