Thanks guys, some food for thought! Looks fairly plum as is with a straight edge so I think I'll just clean up the edge and leave it as is.

Had wanted to fill the gap with Timberlake or something but that's gone out the window now that I think I'll leave everything natural apart from the top. Stained up the top and damp ragged the entire thing and it looks great as is!

Three coats of Japan black feast Watson later:Click image for larger version. 

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