It may flash but then not lead to a conviction though surely?Some definitely still flash, I've seen the M25 cameras getting people recently. Also I have a friend got caught for 34 in a 30 so the 10% + 2mph isn't always the case
About 6 weeks ago I went through a fixed camera in the A1 doing (indicated) 60 in a 50 and never heard back.
Like you I'd driven past that camera countless times, but was in my own little world that time.
Depends on the camera type