Bolton MBC seem to be getting on with replacing SOX with LED in the areas that they have said they will convert firtst namely River Tonge, Westhoughton and Heaton.
They have pretty much eradicated 35W SOX and are working on the bigger stuff.
180W SOX has pretty much gone from Radcliffe Road.
https://goo.gl/maps/ZxN9zgmvxND2And on the A6 at Westhoughton.
135W Replacement is underway on Crompton Way and Ainsworth Lane - one lantern was replaced having only been re-lamped the week before!
When they did the side-roads they replaced all the SOX or 50W SON, however on the main roads, bigger wattage stuff they are simply replacing the SOX, and leaving the 150W SON stuff (mostly CMS fitted) which gives an unpleasant mixed street scene at night.
Fittings used are Holophane Factor in various sizes.