Seaside inspiration

From flicking through flickr i have found a set of photos from a local source that i would like to try to replicate. I feel that combining this effect with the idea of not going by the main rules of seaside photography, i could create an appealing image. I like the effect of the slow shutter speed in this shot, by Gary Bown

I think that, to replicate this type of effect, i need to use an ND8 filter. This will help keep my shot from over exposing when having a shutter speed slower than 10 seconds.