Some reading for you:
http://www.color.org/AdobeBPC.pdf
http://cias.rit.edu/~gravure/tt/pdf/cm/TT5_Jorge01.pdf
Thanks very much for those links. I hadn’t seen either of those pdfs. I think the answer to my question is in these two extracts, one from each link respectively:
Color conversion using Perceptual intent already maps source white to destination white and source black to desti¬nation black. Because this mapping preserves the relationships of the shades, it is unlikely that a whole shadow section will be mapped to the same black value. Therefore, BPC should not be necessary. BPC is available, however, for this rendering intent, to be used with malformed profiles. For a given picture, the user can decide whether using BPC improves the color conversion and can select it or deselect it accordingly.
The perceptual rendering intent was compared to the
media-relative rendering intent with BPC. The results show
very close agreement between both color conversions
over all the near neutral colors, and just slight differences
(less than 3 ΔE00) for higher chroma colors. In practical
terms, the perceptual intent can be interpreted as making
its own BPC and the differences between both conversions
is almost not perceptible. To avoid the confusion among
the users, the perceptual rendering intent should be
suggested instead of the use of BPC.