An interesting perspective of the north Kent coast

[Smiffy]

I think it's more likely to be a chimney from the paper mill.

[MartinR]

Interesting perspective.  If you follow Milton Creek down from the Sittingbourne label you can just see the tops of The Lillies, only the tops though since it appears to be high tide.  I wonder if the smoke plume just below it is from one of the SKLR locomotives.

[Jackie Paper]

Found this image a couple of years ago and annotated it a bit - possibly not super accurately.
I've seen a similar view myself on flights that come up the estuary but never got a good shot of it.