London has been hit by the second major Tube strike in a week this morning, bringing travel misery across the capital with no service at all on two underground lines and parts of three others. Crowds of people have been left stranded on platforms while bus stops across the capital have become overwhelmed. Members of the Rail, Maritime and Transport union (RMT) said members were walking out after last-ditch talks with Transport for London (Tfl) failed to resolve a dispute over a four-day working