Thank you guys, its looking a lot better
Here is a new render with the settings i have used.(changes marked in red)
Just a quick question, what does the "from outside" switch do on skyportal?
Its still looking very grainy, when i up the shadow samples on the skyportal from 16 to 64 (also deleted/recalc both fg and gi on same settings) this is what i get.(image 2)