One of four special £5 notes engraved with a tiny portrait of author Jane Austen has been spent in Caerphilly county and could be worth up to £50,000.

Specialist micro-engraver Graham Short has said he spent the money featuring his work at a cafe in Blackwood.

The artist saw his note was not checked by the cashier and hopes it has ended up as someone's change.

The other notes were spent in England, Scotland and Northern Ireland.

Diners and workers at the cafe spoke of their shock at learning the note could have passed through their hands.