The Department for Work and Pensions (DWP) rejects the "bedroom tax" tag and says the reality is that "a spare room subsidy" has been removed from social sector tenants.
A DWP spokesman said the new regulations are lawful and adequate steps have been taken to safeguard people with disabilities.
More top news
The Government scheme would benefit those aged under 40 but will only run for five years.
Joseph Rowntree Charitable Trust and the Roddick Foundation are under investigation by the watchdog over grants made to Cage.
The Duke of Cambridge became a fearsome samurai warlord - at least temporarily - when he visited the set of a long-running Japanese drama.