Every Christmas, nurse Mini Karuppan writes a letter to a family she doesn't know. She doesn't know where they live or their loved one's name, but they saved her life.
For Mini, 46, had an unwelcome surprise when she entered her early 40s - she discovered she needed a new kidney.
She was placed on the national waiting list and had expected to wait for five or six years for the right donor match to be found. Being of Indian heritage, it potentially made it even more challenging, as donation levels are traditionally lower from black, Asian and minority ethnic communities.
