Bluasfly,
I fly the Airbus narrow body series (A319/20/21) and we operate to CAT 3B with RVR requirement of 75m and NO Decision height.
The worst RVR I've ever landed in was 100/100/100 but the Met Viz on the ATIS was 25m
(had to listen twice to make sure we heard it correctly). The landing was normal but the taxiing from the runway to stand was VERY slow - 25m was probably about right.
Sounds to me like the PRG flight was all operated correctly in accordance with JAR-OPS.
A4
PS The CFM56 doesn't like taxiing in FZFG - I've never seen Fan blade icing accumulate so quickly even with EAI on.
A4