In response to earlier comments.
There was a time when UK ATC was required to log details of all approaches and departures once the RVR fell below a certain figure....may have been 1100m (?) along with details of the actual RVR during said movements. This data was forwarded on a daily basis to the UK CAA Flt. Ops dept who, I understand, compared movements with permitted company minima. I believe that breaches of minima were detected and dealt with via this system.
I don't think this happens any longer. Probably not permitted under data protection legislation. Perhaps a current ATC person could comment.