In an increasingly rare display of altruism, Jack Bloomfield donated his kidney to a stranger. In this video interview with the BBC, he explains why.

Would you give one of your organs up to someone you don't know? That's what 28-year-old Jack Bloomfield has decided to do, by donating a kidney. Jack, from Hamble in Hampshire, is one of a declining number of people doing this and more are needed. In the UK there are nearly 5,000 people who currently need a kidney and people like Jack can help to create a "chain" of donors.

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