Thankyou Maris, that was good advice. I do get annoyed with my camera's inability to see the world the way my brain does
As my lecturers tell me, the camera is a very blunt instrument.
Cheap Ebay filters work ok do they? I'm always a bit wary of the cheap ones, fear they are inferior and dunno whether to take the risk. I've seen countless ones on Ebay though, will investigate further.
What's pre-flashing, I don't know if I'm familiar with that..?

And thanks guys for the masking tip - if I can find a point in the scene which a join line wouldn't show up in too much, I can play around with doing separate exposures for sky and land on the same neg. Or could I just even layer the second sky exposure over the first, kind of burning-in that area? Hmmm