Starbear & Tandemrotor - agree completely with comments about minima busting.
Regarding IRVR's , bear in mind that these are taken from transmissometers sited some way from the runway centreline & at a height much lower than the cockpit of a commercial jet. Although they are the definitive reading for minima, they might not give a true picture of what you may or may not see of the runway.
I don't know what the current system is, but in the 90's we had to send IRVR computer print-outs to CAA Flight Ops together with movement logs which they would correlate with company minima to check for infringements.