Middle-income as well as low-income families are being held back by a "deep social mobility problem" in Britain, says a report.
The Social Mobility Commission warns of many "treadmill families running harder and harder but standing still".
It points to an unfair education system, a two-tier labour market, a regionally imbalanced economy and unaffordable housing.
Prime Minister Theresa May has promised to tackle social inequalities.
The commission's State of the Nation 2016 report was laid before Parliament on Wednesday.…