Thank you Michael. i processed the raw file with DXO. The only addition to the standard automatic inputs from DXO was a bit of "clear view" (16 out of a scale of 0-100 on that slider), which deals with haze by introducing a bit of sharpening as well as a bit of contrast. The noise reduction was DXO prime on an ISO 1000 file. I used prime as the clear view otherwise introduced some noise like speckles on the uniform cloud background and prime was a quick way to deal with that. I usually only use prime for ISOs much higher than that where the magnifier feature in the DXO noise reduction tool suggests that the standard noise reduction is not sufficient.
This was shot on a 1dxii with a 100-400L ii with a 1.4x iii extender at 490mm, f10 and 1/1600s.
Kind regards. Robin