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Ian,
I'll kick this off.
I used a section of 6" steel pipe, and to this welded a flat that allows me to bolt/unbolt it from the lump of concrete that is in the ground. I don't do this as a matter of course, but I figured it would future-proof the idea. Mine is only about 600mm tall though, built for a newt.
Catch of this is that I also have another section, same pipe, and on a three legged wheelie thing, so in effect a "rolling pier", and the mount is swappable between the two. Of late I am using only the rolling job, as it is a matter of rolling it out, winding down the "feet" and attaching the 240 volt. It is as close to the pole as it needs to be (although while the moon is about I will fine-tune this a little), and with the refractor/guide-scope attached rolls easily.
I voted steel, but can see no reason why the plastic filled with concrete wouldn't do the job either.
Gary
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