A Second rail union is to join RMT in two 48-hour strikes in February to protest at plans to close all London Underground ticket offices.

Transport union TSSA said its members backed industrial action by 58.8 per cent and will now join the two walkouts from February 4 and 11 already announced by RMT.

The unions say the controversial plans to close all 260 Tube ticket offices will lead to the loss of 1,000 jobs and will affect passenger safety and security.