Just read that DWP press release. It repeats the made-up figures.
So the press release says:
Troubled families are defined as those who:
? are involved in youth crime or anti-social behaviour;
? have children who are regularly truanting;
? have an adult on out-of-work benefits;
? cost the public sector large sums in responding to their problems, an estimated average of £75,000 per year.
But the data was collected about families who met five of the following criteria:
? no parent in the family is in work
? family lives in overcrowded housing
? no parent has any qualifications
? mother has mental health problems
? at least one parent has a long-standing limiting illness, disability or infirmity
? family has low income (below 60% of median income)
? family cannot afford a number of food and clothing items
And figure of "120,000 families" is from a secondary analysis of that data, with error margin ±200,000. (Unless by an incredible coincidence the DWP did special research for the first definition, and magically happened to get exactly the 120,000 figure they'd been touting for years. I'm sure they'll happily show the additional research, if so.)
The "costing £75,000 a year" comes from a different set of 46,000 families,
identified by yet another different set of criteria by the Dept of Education. And the £75,000 includes all the normal health, education and welfare costs all children are expected to accrue.
So right from the off, the DWP press release looks like notable tosh.