Thanks, I went to try your sugestions and was wondering if you could cast your eye over these settings and let me know these render settings look about right?

Here's the Atmosphere Editor Settings, I couldn't find "Outdoor Radiosity" but Selected "Global Radiosity" and selected "Optimize for outdoor rendering" instead.

I bumped the "Sky dome lighting gain" to 2 from 0, is this generally enough? "Shadow smoothing" I left at 100%, is this the same as the soft shadows setting you mentioned?

Thanks again