Mingle2 - Free Dating Site In The Uk. If you don’t want to be a single British, join in the Mingle2 free dating sites UK right now! And here are great features of this service! Widely used: Mingle2 is one of the largest free dating sites UK to make new friends, find a date, or to meet other men and women to chat online. Therefore, this is a reputable site that you should try.