Thanks Keith, I appreciate your help.

I had got it loaded up from cold & dark by following a tutorial on Youtube. What had been holding me back when trying myself was the time the APU switch has to be held in the start position, so I think the APU was never actually starting.

Once I had the aircraft in ready to fly state, I saved that as a custom state, but that wouldn't reload. I will try your tip about getting the APU running first, then trying to load my custom state.

Do you have the ground proximity altitude call outs working as you come in to land? After getting the aircraft working from cold and dark, when I tried flying a few circuits my altitude call outs were not working, although other sounds were working ok. The altitude call out files were there in the aircraft file. I have since uninstalled the aircraft, and reinstalled it from a fresh download, so hopefully the altitude call outs will work now unless I am missing something.