Two men directed a taxi driver to a secluded location in Olney and robbed him.
Police have released an E-fit image of a man they would like to speak to in relation to the robbery.
At 2.30am on Saturday, January 4, the taxi driver collected two men from outside the Wonderworld nightclub in Central Milton Keynes.
The two offenders directed the driver to a secluded location in Olney. The victim then stopped the taxi and refused to go any further.
The offenders threatened the driver and demanded money.
The victim was punched in the face as he handed over money. He did not require hospital treatment.
The offenders then made off on foot.
Anyone with information should contact detective constable Leanne Shepherd on 101.