Alright, I made a post a while back when I discovered an issue around the front driver side axle. Though after a little further inspection today in the sunlight this clearly is not axle grease. So what part do I need to order to solve the problem?

This, right?
Seal - Front Axle (Part # FTC4822) - Land Rover gaskets and seals from Atlantic British

 

If it's not axle grease/gear oil, then maybe it's CV joint grease. You'd need a boot, clamps, and some grease.

CV Boot Kit Outer (Part # TDR100780) - Land Rover swivel ***** & parts from Atlantic British

RovahFarm for all your new Land Rover Parts and Accessories

 

If it's gear oil then you probably need this:

Seal - Front Axle (Part # FTC4822) - Land Rover gaskets and seals from Atlantic British

 

Like I said in your last post, bad CV boot.