Julia Somerville, Gloria Hunniford and Angela Rippon reveal the unwelcome guests said to be scuppering more holidays than ever. As bedbugs return with a vengeance, the team is out with the sniffer dogs hunting them down in hotels and on planes. But could you unwittingly be giving the creatures a lift back to British shores? Travel expert Simon Calder has advice on staying safe abroad, and, with reports that jellyfish are on the rise, what's the truth about the threat they pose – and the best way to avoid being stung?