Was just wondering if there is a quick way, or an Addon/Script that quick selects edges in a line so that I can mark seam for UV.
I have a really dense mesh that is just full of tris… (I’ve converted to quads but there’s still a lot.)
Thanks in advance. 
If your mesh is that much of a mess, you probably need to retopologize before you bother unwrapping.
It’s just a free model D/loaded off of the internet, I’m improving my texturing etc right now so taking anything I can and trying to create a good render.
Hold down Ctrl while selecting an edge to select all the edges from previous edge to this one. Also set the Mesh Options to Tag Seam to automatically mark selected edges as seams
Perfect thanks Rich!