By Astrid Cooper & Rom Preston-Ellis A quarter of women are more likely to discuss relationships, holidays and social plans with their workmates than their partner. A study of 2,000 females found career advice, parenting difficulties and mental health challenges are among the topics they open up about in the workplace. This is because colleagues offer impartial advice (36 per cent), they’re around when you need to vent (35 per cent) and give different perspectives (26 per cent). However, 44 per cent admit to opening up to friends instead of their partners because they can be more honest with t…