Under EU OPS, if the aircraft has rollout guidance and redundancy is provided then MID, ROLL OUT RVR can be as low as 75 m. Without Rollout guidance and redundancy given RVR MID has to be 125 for the manual rollout.
I fly a 777 which obviously DOES have roll our guidence, yet the minimum CatIIIa vis we operate to is 200,125,75 with a 50' DH.
Why? Because the only time we are likely to be restricted to CatIIIa is if we carry an MEL or have an equipment failure which leaves us Fail Passive or without roll-out guidence- in which case the 50'/200m applies.
The OP specified 200,125,75 m and I gave the rationale for those figures in an Aircraft that does not have roll out guidence.
Perhaps I should have been more explicit for the sake of the pedants, but that doesn't make what I said Bollocks, and you, 9G, might consider your tone when addressing others.