I think it might be interesting to know what % of the &80,000 revenue (Wirral) or nationally overall, is going to the operating company (NCL)?
Here in the USA, a lot of the red-light cameras were thrown out because the companies operating them were making money out of it on a per-ticket basis - and it was determined to be a conflict of interest (the more flashes of the camera, the more profit they made). I think they now have to operate on a flat fee basis, if at all.
Something also iirc about the operating companies themselves issuing "tickets" too (rather than the police or whatever...)
I wonder if the same thing could be a possibility here?