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.

See more on Inside Out South on BBC One in the south of England on Monday September 10 at 19:30 BST.