Seven out of 10 social services departments say they cannot cope with the demand for beds for elderly people with dementia, according to a report from the Liberal Democrats.Out of Sight: the forgotten elderly also found that 58 per cent of social services departments report shortfalls in provision of specialised dementia care, and 62 per cent of councils report overspends in community care budgets.Liberal Democrat health spokesman Paul Burstow said: 'The spotlight tends to fall on bed-blocking in the NHS, but the untold story is of families struggling to cope with complex needs and challenges at home.'