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I was reading an old article on sports car suspension tuning. The real term "British" for the symptom is JUDDER.

The article implied that judder is typically caused in order of probablility (assuming the tire and wheel are balanced):

1) out of round tires or separated belts/plies
2) out of round wheel or bent wheel
3) steering rack slop or mis-alignment
4) loose lug nut(s) or pins
5) worn tie rods or bushings
6) hung brake caliper or drastically warped rotor
7) bad bearings or spindle
8) non-isolated steering column (no rag joint or bushing)

It appears that most of us have 8.
However, 8 does not cause Judder it just allows the vibration to be felt at the wheel.