FAQ said:
7. It’s better if a ferrite is used to connect signal ground and enclosure ground.

absolutely not, just the wire doing the job provides more inductance than I want.

below 'ground' refer to words on schematocs, 'earth' refer to a pipe hammered into the earth.

If you even consider 7. above, you should have NO connection. It is, in some cases, be advantageous/required to connect signal ground and earth in other cases it is better not to do so. Enclosure ground should always be earth. The issue is not really what and how to ground, but "what is ground" and "where is ground".
How to do it, described with an example:
you have some equipment that is in two enclosures some distance away. In enclosure1 you connect signal ground to earth, in enclosure2 you connect signal ground through the cable and enclosure1 to earth and connect enclosure2 to earth at its location. Connecting signal ground to earth there directly or via a ferrite will only make matters worse.

Just writing all this I realize there is ONE condition where 7. above might apply"
use a ferrite to connect signal ground and enclosure ground if the circuit is going to blow, burn or be a shock hazard if it loses earth.

Erik