I had not encountered this before! Produced by Jerol of Sweden and consisting of an inner fibreglass body wrapped in an UV-resistant outer layer.
Three of these were supporting a roundabout placard at the junction of the A18 and A46 near Laceby.
Unfortunately the fact that one of the three pillars was placed right in the middle of the pavement means that they are not pedestrian friendly. But only motorists have right of free passage, correct? Bah.