Graeme, I'd like to summarize "for dummie" out here. Since sRGB assumes the display at D65, and V2 profiles from color.org use D50, they are not supposed to be used as input sRGB profiles. That is, the kind of profiles that specify meaning ("units") of an RGB number triple in an image file. Instead, they are provided partly for a specific soft-proofing scenario with a dumb CMM. For input sRGB profile, one must use a profile from some reliable source (like argyll/ref/sRGB.icm). But incorporating input sRGB profile in an image file is pointless because all the consumer software already assumes such correct sRGB profile. Right?