Sadly, I gave up on this one and wiped it out. It just wasn't going the way I wanted it to. I had every intention of it being a quick "Pochade" style piece, but it quickly became laboured, so I stopped, photographed it and then painted over it.
I'm aware that the red van is "floating" and there's lots of textures missing from the lawn and building, etc. If I had carried on, I would have sorted all that out - I just didn't want to carry on with it :-(
I think I'll go back to doing simple still-life subjects until I get my colour-mixing skills honed and hopefully find my own "pallete".