Spotted them last night on the A24 by the roundabout at the leatherhead end, matrix boards said they go live in July (i think it was the 2nd). Looked like they were only on the side heading toward Dorking for now
Thanks for the heads-up 
Passed back through today, cameras are in both directions between the Texaco garage roundabout near leatherhead and the roundabout near Rykas (although there’s only one set of cameras at each end currently, so nothing to pick you up if you turn off at Mickleham)
They’ve been making that road past Rykas more cameratastic every year since I used to live there back in '11…