murambi - Thanks for the links it has proved very helpful What was your render time like, and would you mind sharing how you went about creating the grass and settings please.

honestdom - Thank you. I dont know why i didnt look there in the first place!

GecT - Yeh that is a realy helpful tool thanks for the link! One problem I am having is that when painting the geomity thats a mip_binaryproxy, it only works with painting duplicates not instances and thats with 'Preserve input connections checked'. It is also taking a considerable time to render out an image with not that many instances, have i done somthing wrong or am I just being impatient?

Still Not looking great