Dopest female MC right now? Jai. Easy. It's been out for a little while now but Jai's On My Jais:The Prelude is a great release from a true wordsmith. 14 tracks of Jai all on her own is hardly necessary - one verse on one track is enough for her to prove herself. But, since she's so skilled you'll be thankful there are 14 tracks.
Steg G and The Freestyle Master are Scottish. Steg G produces and The Freestyle Master does Scottish rapping. Their latest single Cool / Big Bad City is a sample-free affair, well, apart from the Family Guy sample that heads up 'Cool'.