Reflections in Glass

Hey All,

I’m having a terrible time getting reflections in my glass material. I’m rendering a car making use of the most recent Automotive shading pack. The only lighting in the scene is the HDR backdrop
Everything else reflects nicely (see attached), but even using the Automotive material presets, I cant get any reflections in the windows. I know its possible (True Photorealism in Real-Time | GDC 2017 | Unreal Engine - YouTube)
but I seem to be missing something. Any ideas would be greatly appreciated.