My Aunt has been placed in a 24 hour care facility by our distant cousin who will give us no info. Any advice?

I'm living in England. Can we, my sister and I request details or see papers giving our cousin POA and Health Proxy - They told us they would give us copies of forms but then decided that we should not have them and have cut off all communication with us and will not give us any information on our aunts health. We have visited the home 3 to 4 times and seen our aunt but there is never any senior official of the home available to talk to us. They reliquinished her apartment and all her possessions and we were told by them that we could not enter her apartment. Our Aunt was a loner and lived a very simple life and liked her own company and we would write and call her from england and visit her but she liked her own space. Unfortunately she got sick and has now been deemed with dementia and our cousins told us 3 months ago that any plans she had asked of us could not now be carried out. What can we do Have we any rights been her only living relatives.