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Comments

I know the problem Seamus.......less able to give a constructive answer except to say I think it is just that any camera struggles with this much contrast/ range of light. this is where I resort to bracketing, adding gradients in photo shop or juggling with ND Grad filters often to no avail I'm afraid! What ever you did to the Raw file it was effective and I would be tempted to to knock it!! 
I hope someone more knowledgeable will come along and give you a more rational explanation soon
Ben

I hope someone more knowledgeable will come along and give you a more rational explanation soon
Ben

I think you've done a good job to retain the detail in the light coming through the cloud. Maybe all that is needed is to dodge the foreground in a bit more and maybe a touch of saturation. There also seems to be a bright line running along the top of the distant hills on the left which I noticed when switching between the two versions you uploaded. I assume this is a result of your processing to lighten the land.

Zander
Well spotted. I missed that bit to the left on the horizon. The more stages, the more likely I am to miss something. I also found it beyond my skill to dodge while retaining adequate contrast. But the exercise has been productive from the learning point of view. What I would do now, faced with the same conditions: Cloudy white balance; high speed continuous shooting; partial metering; auto exposure bracketing (1 stop). I'd then check the lcd screen and repeat, if appropriate, with additional exposure compensation.
Scutter
I'm glad someone else is as much in the dark as I. We can only do our best.
Seamus
Well spotted. I missed that bit to the left on the horizon. The more stages, the more likely I am to miss something. I also found it beyond my skill to dodge while retaining adequate contrast. But the exercise has been productive from the learning point of view. What I would do now, faced with the same conditions: Cloudy white balance; high speed continuous shooting; partial metering; auto exposure bracketing (1 stop). I'd then check the lcd screen and repeat, if appropriate, with additional exposure compensation.
Scutter
I'm glad someone else is as much in the dark as I. We can only do our best.
Seamus