I contacted the CSCI about a care home I moved my mother from. They never investigated and never came back to me!
Fortunately my mother is in a wonderful care home now. She recently had a fall at night and had no apparent injuries. However, the following morning she complained of a pain in her ribs and a doctor was called immediately.
Care homes can be really good if the management is good and appalling if the management is poor. Personally, I would move someone from a care home with poor management - it can be traumatic for the elderly to be moved but I would never leave anyone in a care home that fails in its duty of care when it comes to medical matters.