The proportion of firsts handed out by UK universities has soared, with a third of institutions now grading at least one in four degrees with the top honour. In some cases, the proportion has more than doubled in five years, according to Press Association analysis of official data. New figures detailing student enrolment and qualifications show a quarter of students at UK universities now graduate with a first-class degree – a dramatic increase from just 17 percent in 2012. Last…