The "Bedroom Tax" is one such policy and I'm grateful to Trudy Baddams for asking how many people has the DWP helped into work by introducing the bedroom tax
The answer was essentailly:
The Interim Report does indeed show affected people looking for work (or more hours/better pay) but also:
"Our survey found, however, that most (87 per cent) of those claimants who said they
have looked for work also said they that, in the first six months since RSRS had been
implemented, they had not been able to find work or secure better paid employment.
From the qualitative work with claimants, most participants who were able to work had
considered earning more through starting work – although this was not solely in response
to the reforms, rather that they had been hoping to do so anyway. Those who reported that
they were looking for extra hours or a better paid job more often reported that this was in
response to the policy."
So it doesn't look like the policy is actually getting people work.