More answers... RAW is independent of colour space! When you come to export to jpeg/tiff you can choose the colour space based on what you want to do with the image. As with WB etc, the colour space you set in-camera makes no difference to the RAW file. It's only relevant if you've set your camera to shoot in Jpeg mode. This means that for yourself and Tom, the colour space you're choosing in the camera is actually doing nothing since you both shoot in RAW. It's down to the software that you're both using to convert to Jpeg.
Also, if you upload a jpeg that's encoded for Adobe RGB, although the browser will display it in sRGB, I believe the colour space in the actual file remains intact since the browser doesn't actually edit the file. Someone downloading the file will get it with the colour space that you originally set.
Sometimes ignorance is bliss!