Police have released a CCTV picture of a man suspected of stealing a cash box containing a four-figure sum of money in Langdon Hills.

The cash box was stolen from a security guard outside the Harvester restaurant, in High Road, on Thursday at about 3pm.

Two men wearing balaclavas demanded the cashbox from the security guard and made off in a stolen silver BMW coupe, registration LS58 FKN, which was being driven by a third man.

This vehicle is thought to have been in convoy with a white transit van, possibly a Mercedes Sprinter.

Both robbers are believed to have been very similarly dressed.

The cash box was later found discarded nearby with the contents, a four-figure sum of cash, missing.

Police are also looking to trace two witnesses who were inside the Harvester when the robbery took place. They gave details of the BMW to staff but had left prior to police arrival.

Anyone with information is asked to call DC Lucy Bowman of the Kent and Essex Serious Crime Directorate on 101 or Crimestoppers on 0800 555 111.