One of the bosses of GTR, who run under-fire rail company Southern, has apologised for the travel chaos commuters will face throughout December. The RMT and Aslef unions have called for a number of strikes across the month over a long-running dispute about the changing role of conductors on trains. Alex Foulds, the deputy chief operating officer for GTR, also called the Southern service "very poor" and said it was "not good enough".