Union leaders are to press for a payment of at least £500 for Tube staff working during next year's Olympics.
The demand was announced by Bob Crow, general secretary of the Rail Maritime and Transport union as London's Mayor said he believed it was "very unlikely" there will be Tube strikes while the Games are on.
Boris Johnson told MPs he is not worried about the idea of crippling strikes during the event and pointed to the smooth public transport operation for last month's royal wedding.
He told the Culture, Media and Sport Committee: "I think it will be very, very unlikely that there will be industrial action but clearly it is important that we continue our discussions. "We are having our pay rounds now which are progressing well and we need to get that right."
Mr Crow said he wanted a deal similar to one agreed for Network Rail staff of a 10 per cent wage rise and a one-off Olympics pay increase of £500.
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