Are phones and tablets behind agonising syndrome that ruins the lives of 340,000 people in Britain? As cases surge by 25 per cent, experts warn that texting quadruples the risk - so here's the simple way to tell if YOU'RE next… ⊖⊖

Britons spend an average of three hours a day glued to their phones. Now experts warn it may be fuelling a painful nerve condition that can leave sufferers struggling with basic daily tasks.