I would definitely agree that serious speeding seems to happen much less than in the past. It's rare, at least round here in the SW, to get people flying past at 100+. I went to London via M5/M4 and back via the M3, and not very much overtook at all, and I don't think I went much over (GPS) 75.Very surprised at the comment that there isn’t much real speeding now. that doesn’t match my experience on the M40 and M6 recently, though I think there has been an increase in slow drivers (fuel/battery costs/conservation??).
The worst bit is inbound from Reading with 4 lanes. The inside two lanes were virtually empty the whole way. Oddly the M3 was fine on the four lane section, you obviously get a better breed of drivers in Hampshire