It is likely that a domiciliary care need will create an entitlement to Attendance Allowance which is a non-means tested benefit, payable to those who need to be helped. In addition there may be an entitlement to Pension Credit or a range of other benefits.
If the care is provided by the NHS, such as community nurses, then these are free of charge. If the care falls within the definition of Intermediate Care which generally means it is to prevent you going into hospital or to assist you when you have just come out, this will also be free for up to six weeks.
In terms of home care arranged by Social Services, each local authority has discretion about their charging arrangements. Any charges made by the local authority must be reasonable and reflect your overall circumstances. the Department of Health have issued charging guidelines for England, detailing the income an individual should be left with each week after care changes and that the full cost of care provision should only be charged if individuals have assets of more than the upper capital limit, excluding their home.
It should be noted that in Scotland, personal care is paid for by the Scottish Executive and any charges will only relate to non-personal services.