I came across this quote from David Blayney Brown:
"Probably in the same year  Turner visited Sussex landowner, Jack Fuller at Rosehill Park, Brightling to begin work on a picture of the estate.
It was possibly Fuller who commissioned the series of watercolours of West Sussex which were later engraved as Views in Sussex."
The question is surely Brown means East Sussex - as the pictures show Brightling Park, the Vale of Heathfield, the Vale of Ashburnham, Pevensey Bay and Battle Abbey - all firmly in East Sussex.
"The Art of JMW Turner", David Blayney Brown, Knickerbocker Pr; ISBN: 1577150309