Tube drivers could be going on strike after rejecting a pay offer which would have raised their salaries to almost £70,000. Staff on the Underground have been offered a 3.8 per cent pay rise by Transport for London (TfL). National Union of Rail, Maritime and Transport Workers (RMT) general secretary Mick Lynch is urging members to support industrial action over what he claims is TfL’s “failure to table a suitable pay offer” during negotiations. The pay increase offered by Tube bosses would take the basic salary for London Underground train operators to £69,600 a year, up from its current level…