Hi there,
I can say from experience that LogicaCMG's culture is generally relaxed and the work/life balance is manageable depending on what you're doing and where you are.
Not sure what you mean by flex. working initiatives exactly but remember LCMG also has a reputation for underpaying their people. The attrition rate is relatively high because of this. Again though, it depends where you are and what you're doing.
Training is generally good but largely project-dependent. That means you don't get a budget.