Alright, for the record how would I make sure the surfaces of the green channel point down?
Thanks for the help, you drew my attention to the fact I wasn’t using the correct UE4 presets, as such I didn’t a) have a metallic map and b) had the wrong Albedo (noticed this myself when I saw that your screen grab said ‘AlbedoM’). So I wasn’t getting the metalness through that. Updated my material node and all is fine.
I’m sure it can be tweaked but it’s working wonders.
Thanks again