CCTV has been released in connection with an incident of racially aggravated public order.
At about 11.25pm on November 28, a 31-year-old man and his partner, a 34-year-old woman, were shopping in Tesco on Stratford Road, Wolverton, when another shopper came up to them and became verbally abusive to the man, using racist language towards him and his partner.
It is possible the offender may have left in a silver Mercedes.
Officers are keen to speak to the man pictured, as they believe he has information which would prove important to the investigation.
Any witnesses can call police on 101 or Crimestoppers, anonymously, on 0800 555 111.