http://www.bbc.co.uk/news/uk-england-15695085Kent Kidney donor helps total stranger
Two years ago Helen Marston from Broadstairs in Kent made an extraordinary decision to donate one of her kidneys to someone she had never met.
The operation is a major procedure and is not without risks and complications.
Helen has had to undergo 16 months of medical and psychological tests to ensure her suitability as a donor.
The recipient, who is waiting for Helen's kidney, will never know who it belonged to.
We follow Helen's journey as she becomes only the 67th altruistic kidney donor in Britain.
Inside Out London and South East was broadcast on Monday, 14 November and can be seen on the BBC iPlayer nationwide until 21 November.