Care home providers have been told by government to stop all visits to residents from friends and family. 

Government guidance is here:

The latest government instruction is for everyone to stay at home and avoid contact with others. This is particularly important for older people and those with certain medical conditions. Until this advice changes, swap visits for phone or video calls. Talk to the care home or housing scheme manager if you have concerns about how to stay in touch and ensure the welfare of your relative.
(From: Independent Age

Care Quality Commission (CQC)

The CQC is the independent regulator and inspector of health and adult social care in England.  They make sure health and social care services provide people with safe, effective, compassionate, high-quality care and encourage care services to improve.

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CQC Covid-19 response: