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On roadworks they're on yellow poles on the verge as per the big photo on Greenbank's link. Maybe not obvious if you're not looking for them.
grams-
Ah yes, a quick look at Streetview shows them. Guess there's normally a load of lorries in the left hand lane so not that visible.
https://goo.gl/maps/qjVFDrGybCgoT8pbA
aggi
There's definitely loads of cameras on the smart motorway sections. I'm not so sure about the long sections of roadworks (for instance that big stretch on the M1 around J13), have never noticed any.