All the last remaining SOX lighting on the M25 (to my knowledge), between Junction 30 and 31, was extinguished last week. This may be in connection with the ongoing works to relieve the bottleneck between the M25 and the A13.
The works involve widening the A13 to remove the existing lane drops where it intersects the M25 at Junction 30 and improving the slip roads on and off the motorway. The central reservation-mounted Philips MA60s between Junction 30 and 31 were once part of a once mightily long 33 mile stretch of unbroken SOX lighting on the M25 from Junction 23 to Junction 31.
As Junction 30 and 31 are only about half a mile apart, the alterations to the junction's slip roads will likely result in their permanent removal.
Above image from
this newspaper report from the Southend Echo As far as mainline SOX is concerned, yup it's gone. Sliproad SOX OTOH exists at J12, J21, J22, J23, J24, J25, J26, J28 and J29 (not sure about J30 at this point).I drove through junctions 26-23 today and can report that the MAs on the slip roads from J25-J23 are being replaced - new columns have gone up next to them but with no lanterns yet. I'm guessing the replacements may be LED Urbis Amperas as these junctions all fall under Hertfordshire jurisdiction. This must therefore be the reason why the MAs haven't worked since the M25 widening! The MAs on the Essex junctions (24-26) still remain for now, but whether they will soon be replaced as well is unknown. It's just been reported by Essex County Council that they will be going all LED from 2017 onwards, so it's very likely! The J30 ones on both the sliproads and the mainline carriageway are definitely going though due to the junction improvement works going on there.