Can't get character to slide on low friction surfaces

I am trying to get a character to slide on slippery surfaces but can’t seem to get anything to work.

With a simple 3rd person setup I have put a large cube in the world at a slight angle and given it a friction value of 0.001.

If I then place a cube that is simulating physics onto the large cube it slides down as expected.

When I stand on the same slippery surface with my player character there is no difference from any other surface.

I have read a few posts that refer to taking away the braking deceleration and reducing the ground friction of the player, but these just change the character to act as if it were on a surface with these settings, rather than the required ability to be affected depending on the type of surface being traversed.

Is there any way to do this or setting that I’ve missed which will make this work?