I've just purchased a Thorn Gamma 6 lantern, that will arrive in the middle of next week.
It's going to be easier to make this into a floor lamp as it's a post top lantern.
I reckon all I'll need is a post of the correct diameter and a pot to put it in, then I will use some of the grit, from the gritting bin across the road as that sets hard, to keep the post upright.
Then we will be in business.
Looking at
this website I'm pretty sure that the lantern I'm getting is from the '90s.