Is there any way that I can get a material to pan/move a texture along the direction of a spline?
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Yes ( me again! ), you just pan the UVs 
As long as you pan them along the mesh, it will move along the spline. It’s going to be panning either in U or V, give both a go…
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Interesting, although this does work, I am noticing a problem.
When it comes to bending parts of the spline, the textures are essentially simply cut off in a sharp manner showing the repetition of the mesh (a plane in this case)
Is there a way around this?
Not that I know of…
Apart from being more careful with the spline
High poly mesh also helps.
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That is a real shame, but having a higher subdivided plane is indeed improving it by a lot allowing me to reduce the replication count so that the intersecting planes textures is veryu infrequent. Thanks 
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