Finally after several weeks waiting I collected my pier from the local
fabricator and looks like it went together well

Its a lot heavy than I originally expected - needs 2 people to move it
probably around 70kg mark I think and put together per my instructions
with what he had on hand as he was close by . Its just painted in primer
and I will respray it over the weekend.
The size is 1m of 180mmx6mm pipe with 20mm plates and gussets
top and bottom and M20 /20mm bolts and holes in base plate which
is about 380mm.
I dug a whole for the concrete last weekend at it came out at 700x700
and 1m deep - thats when I hit hard clay and shale . Hope to pour the
concrete on Sun .