In a Facebook post, the Force warned: “We’ve had a report of a man claiming to be from the JEC cold-calling at an address without a uniform or an ID and driving a small white unmarked van.

“Always check ID and credentials of any tradesmen visiting your home and if you’re not expecting a visit, check with the company before allowing anyone access.”

They continued: “If you are visited by a person you suspect is not who they say they are, please report this to us.”

Jersey Electricity added on Twitter that all of their engineers “use marked vehicles, wear uniform and will present ID.”

Reports of suspicious behaviour can be made to Police by calling 612612 or via Crimestoppers’ anonymous online form.