You just beat me to it Andy,
I tried a few shots today to compare those taken in RAW and those taken in Jpeg. Raw were converted to tiff in NX2 and then IR conversions were done in CS2 using the Khromagery action. I could not see much difference between the two. So despite the massive difference in the cameras write to card speed I will stick with Nefs to give myself 16bit images. The advantage of that will no doubt be in lack of posterisation in the skies.
Just for a chuckle I took an infrared and a standard visible light shot in order to try and paint the lavender blooms in on the IR version.
Very difficult to find the flower heads in the mass of white, so next time I will try something a bit easier.
Don