The game will only display non wide-screen video settings if I uncheck full-screen. If full screen is checked then it displays ALL video modes including some weird 30Hz and 29Hz ones.
I set my desktop and the game resolution both to 1270 x 720 which gives good Performance on my PC. I needed to do this for the game screen to occupy all of my monitor.
Once set-up and in the game performance was much improved with tree's looking very nice, but with flickering shadows.
Flying over London I was getting decent framerates ( 25 fps)
Its definitely much improved, and I have not suffered any crashes once in game.
Keep up the good work