Armed with the knowledge gained from failure, I have handed the task over to my good friend Percy V. Runce.
So to Mark II...
In desperation, I painted over the previous attempt with 3 coats of white emulsion to cover it. Then I mixed up a yellowy green colour and lathered it all over the area up to where I wanted the horizon to be - in hindsight a slightly lighter shade would have been easier to paint over!
Once this had dried, I then began sketching on where I wanted the fields to be (initially just on the end part of the back scene by the bridge as I wanted to do just a section to ensure that I was happy with the field sizes, colours, and general look).
It was then time to fill in the fields with various shades of green. Once the fields had dried, the hedge lines, trees and wooded areas were painted in a very dark mix of a greeny-brown. This was left to dry thoroughly before the highlights were added.
Whilst not perfect, I am at least an awful lot happier with the outcome. Some photos show progress so far (approximately 1/3 of the total back scene) :
The photos have been taken using a spare layout lighting tube for illumination (with daylight coming in through shed door and window). Personally I think the result looks a little better than the digital images illustrate.
PS I haven't as yet started to add any shadows to the scene on the right of the road