SPECS on M6

[buckshee]

I've just been up the M6 for the first time in a few months, and noticed that the SPECS cameras have been rempoved in the Jct 19 vicinity on both North and South carriageways. When and why did this happen? Were those cameras just a "dummy" system, like fake burglar alarm boxes on houses, merely acting as a visible deterrent?
Any body on here ever get a NIP from the SPECS system on the M6?