After a lot of searching and trying various things I found an incredibly easy method to root my new Doogoo Leo DG280 phone. It is an Android 5.0 r15 version by the way.
Simply follow the link (http://www.kingroot.net/) and download & run the APK file. Simple as. Do not be frightened by the Chinese website, look at the pictures beside the links. Also the android app is in English for me, so very easy to follow along, 1, 2, 3, rooted!