It stems from the confused interpretation of the following:
IMCR holders in current practice are recommended to add 200ft to the published minima for approaches, but with an absolute minimum of 500ft for precision and 600ft for non-precision approaches.
Question is, is the second half of this sentence recommended or mandatory? More than one PPRuNe member has raised this formally with the CAA to be told that it is recommended. (Personally I set myself those minima: I only fly 40-50 hours per year and although I manage an instrument approach once a month or so, I don't consider myself a particularly proficient instrument pilot, and I know i would struggle to continue an approach to 200ft or so. But legally I could.)
Tim