The winner of the international prize was the statistic that 90.5% of plastic has never been recycled. The winner of the UK prize was the statistic that 28.7% of all electricity produced in the UK on 30th June 2018 came from solar power. There were also eight highly commended statistics. Read the press release here.
Jen Rogers, who was on the judging panel, spoke about the Statistics of the Year on the Today Programme on 18/12/2018 and you can find the entire programme here (scroll to 2:37:27) and was also on 5Live at around 12.30pm the same day.