An evening trip to Kimmeridge and the lower light levels allowed a choice of shutter speeds.
For this image, I decided on a shutter speed to retain some texture in the water but give some blur.
1.3 secs at f/22, ISO100
0.6 / 2-stop ND Graduated Filter
RAW file processed in Adobe Lightroom with exposure and contrast tweaks
Black & White conversion using Silver Efex Pro plug-in
Cold blue tones added in Adobe Lightroom