What are these cameras you see strapped and chained to lamp posts?

I took the car out for a quick drive round the block for the first time in ages. Anyway, when i got back i realised it ran out of tax at the end of last month and forgot all about it as i hardly use it lately!

I didnt even notice the camera at that point, but noticed it when i went past a few hours later in the van. Its just a camera temporarliy attached to the lamp post.

I dont think i was doing over 40 as the car would still have been cold-ish so i wouldnt have been revving it or doing any real speed, but im just wondering if its one of those anpr things that would have got my reg as i had no tax!

Its all taxed for another year now, so i suppose ill have to wait and see if anything comes of it.