At the Sainsburys/M&S in Hedge End near Southampton in Hampshire most of the conventional columns have recently been lantern swapped with peculiar LED lanterns.
The first ones I spotted were on 10m columns, and at first glance it looked like an existing lantern had broken away leaving only the spigot, but after taking a second glance it was clear that these were actually new lanterns.
The columns in the photo used to be fitted with Philips HGS203s running 80W mercury. Taller 10m columns were originally fitted with Phosco P426 (MRL6) lanterns running 250W mercury, although there had been casual replacements with Nordex Astra 2s running 250W mercury. The Holophane mercury high mast fittings are still intact, as are the Phosco P426s (and a Thorn Civic) in the M&S delivery yard.