Millions of people in the UK are clueless when it comes to using a road map instead preferring to rely on technology. And the switch has been partially blamed for leaving huge numbers of people simply unable to identify where some of the country’s most famous landmarks are, such as Big Ben in London, according to new research. More than one in 10 (15 per cent) UK adults have never used a road map and 2.5 million of those wouldn’t…