Scalp's hair is NOT affected by "wind" forcefield effector but cube primitive IS I am trying to move my hair using a wind forcefield object.
It does not have any effect.

However, when I create a new cube mesh and attach identical hair to that and place it within the same wind effector, the cube's hair is effected.

What am I doing wrong?

Please see my blend file for a simple recreation of the problem.

Thanks in advance for any help!
Aha, very simple solution.

The forcefield must exist on the same layer as the particle system under the object data tab to be affected.

Use shift+left click to add multiple layers to the wind forcefield.
See picture attached.