Road safety campaigners have called on the Government to ban sales of laser jammers that stop speed cameras catching dangerous drivers after it emerged they are being promoted on Amazon and eBay as a way to outwit police.

Adverts promoting the cloaking devices as a way to avoid speeding fines have featured on the online retailers with reviewers boasting how they have fooled traffic officers, The Telegraph can reveal.

Last night, the charity Brake called for a crackdown on the sale of the “morally reprehensible” units that can scramble speed camera beams.

Timothy Hill, a 67-year-old businessman, was jailed last week for eight months and banned from driving for a year for perverting the course of justice after using a jammer in his Land Rover.