On page three of the ATSB report there is a picture of the accident aircraft panel.
"...2 Avidyne integrated flight displays ... The brightness of the screens is controlled manually for night operations..." "...an Embedded Terrain Awareness Warning System..."
The panel photo shows a green terrain on the MFD and a red/brown earth colour on the PFD.
Not being familiar with the Avidyne i'm wondering what the displays would have shown during the night approach to the Boxwood airfield. Noting the experience and currency of the pilot i would guess the displays were dimmed during flight to suit the apparently fairly dark night thus retaining the pilots night vision.
Would the Avidynes automatically go bright yellow or similar due to a terrain alert ? Between a possibly suddenly brightening panel on approach and the vehicle lights the pilot would lose a lot of his night vision.
.