The voter turn out, mostly from bad weather, shows only 40 to 45% of voter turn out however. But such a massive majority vote likely means they can consider it a mandate in any case.
RT claims the low turn out invalidates the results. But they were never binding in any case. They were to indicate to the government what policies to persue. A 95% rejection rate of EU policies is a mandate even at a 45% voter turn out, which is still a better percentage than is often typical at Western democratic elections for leaders.