Back in the old days when IRVR was still new the CAA would monitor landings against the IRVR logs and pilots were threatened with prosecution.
Knowing this , I refused to pass a 450M RVR to an FK27 about to flare following an RVR of 600M but ensured that I put it on tape that the change had taken place during the flare.
We never had that 1000ft rule back then.