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There are more than half a million people living in sheltered housing, accommodation that offers additional support to the elderly, disabled or vulnerable.

But currently, in England, these schemes aren't overseen by the independent regulator of health and social care the Care Quality Commission and councils aren't required to record cases of abuse and neglect in sheltered housing.

It is leading to growing concerns that many vulnerable residents are hidden away and left to suffer without the authorities ever knowing there is a problem.

With a move to care being provided via direct payments, its likely the demand for sheltered accommodation will grow. But there's concern that new developments are being shelved due to ongoing uncertainty over funding.

File on 4 speaks to people who have been taken advantage of while living in sheltered accommodation, who feel they were sitting ducks for people looking to prey on the vulnerable.

And when things do go wrong, with an absence of regulation are there sufficient mechanisms to prevent the same things from happening again?

Reporter: Brigitte Scheffer
Producer: Ben Robinson
Editor: Gail Champion.