wiggy, thanks.
So for academic interest, if the landing were to be made according to the - ‘stop within 60% of the runway length’ (the plan), the remaining 40% should be greater than the last third of the runway (33%); i.e. stop end RVR never relevant.
[ ] ‘Yes the distance can be calculated, but we never do.’ / [devilment]
If the less than 60kts is a requirement, then the question ‘how to ensure this’ should be directed to the regulator. Lest this be another ‘good idea rule’ lacking practicality.
My quandary suggests that I don't understand the issue, nor the regulators point of view.