Whilst I'm sure there are plenty of Ukastle members who can point you in the right direction, it often brings much relief to those discovering that a particular area still retains its SOX lighting, despite the move by neighbouring LAs to shift over to LEDs.
From my own experience, SOX in Greater Manchester has been on the decline for a while. The largest loss was around 2007 with the Amey PFI scheme for Manchester Council. This was probably the last bastion for Atlas Amber Minors, Eleco and Phosware lanterns (not forgetting all the GR150s, 102s and 200s).
Meanwhile, Trafford MBC is well advanced on a programme which will see off both SOX and SON in favour of LEDs, although most of the existing columns (including concretes) are being reused.
The only other borough which maintains any sizeable SOX content is Stockport MBC (nearby Tameside abandoned SOX from the early 90s onwards).
Whilst the 135W lantern is pretty much extinct here as a result of the "Cosmops", the side streets of many districts have for the most part retained their Beta 5s, Gamma 6s, MI50s and MI36s. These include Reddish, Woodley, Romiley, Hazel Grove, Bramhall and Marple. There have been casual replacements of some of them with either LED or QSMs. or the occasional WRTL Libra.
2017 brought in an interesting change, in terms of Stockport's elderly CU / S&S 5m concretes. Whilst those found to be unsound have been replaced, others with just spalling bracket arms are being sleeved to 6m, but the existing lantern ie a Beta 5 is being refitted. Whilst it may be a short term economy measure, it is perhaps good to see the re-use of these lanterns.
Although outside the scope of Stockport MBC, another area where SOX is still to be found (and maintained it seems) is the stretch of the M60 from J25 (Bredbury) to J24 (Denton Island). Whilst the nearby M67 SOX has been shamefully allowed to almost completely die out, the M60 portion is still in pretty good shape. A further line of SOX (albeit quite short) can be found further down from J1 (Stockport Pyramid). The whole stretch of what was previously the M63 was lit with MA60s. This section is all that remains, following a relighting to SON a few years ago.
Hopefully Stockport and other areas will still be a haven for SOX , even after "deadendwaterfall" has been awarded his driving licence.I live in greater Manchester now and even in the last 2 years the decline of SOX has been very rapid. Areas like Clifton and Farnworth which a couple of years ago still had a good bit of main road wattage SOX have now by and large chopped it for LED.
To answer the OP there is still some SOX on the M60 particularly around the Cheadle/Stockport and North Eastern stretches but I suspect one will have to be quick to see it. When I first went around the M60 in 2014 it was covered in entire swathes from edge to edge with SOX now it's only there in small sections. The northern parts just outside Prestwich used to be one of the best areas to see it but ever since they did the work on the motorway they took a lot of it away and some of it is still in darkness.