Cheers guys. It's been a while since I've picked up a stylus! The only 'new' thing for me, mapping wise, were the fields. The commissioner wanted lots and lots of fields.

Flood filled the layer with white and used a pattern layerstyle of tiling fields at a very small scale and then applied an all black 'hide' layer mask. Chose a small, hard white square brush with lots of rotation and scatter and painted in the fields. A stroke layerstyle to give them a bit of outline completed it. I'm quite happy with the effect.