Thanks Louise- that information about 'Best Interests' is really helpful. So presumably her social worker would know if there was a 'best interests' decision? It's made more complicated by the fact that Dad was dealing with all the 'admin' initially, so he may well have been informed. However, he is now at End of lIfe with Vascular Dementia (which came on severely and suddenly) so I may not be aware of all the decisions made. With reference to the COP and Dols, I should have added the further points in the COP letter in my opening post. Here are the COP requirements in full.
A) an explanation of her current living arrangements
B) whether those arrangements include a deprivation of her liberty for which authorisation is required
C) if they do, whether there is a Standard Authorization in place
D) if there is not, the name of the relevant supervisory body, and the anticiplated timescale for an application of authorisation
E) Whether a best interests decision was taken that (mum) would be unable to return to live in her property
Thanks again to everyone who has replied- this forum is so useful and supportive when you feel like giving up!