If you are curious, I wouldn't worry too much about knowing Highlander or not as the Highlander universe only provides a backdrop to the fics. Just avoid the first one in the Torchwood list here (http://aeron-lanart.livejournal.com/20755.html) as that's the one with all the hand-wavy, plotty highlander stuff; everything else is pretty much character driven and based around Torchwood.
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If you are curious, I wouldn't worry too much about knowing Highlander or not as the Highlander universe only provides a backdrop to the fics. Just avoid the first one in the Torchwood list here (http://aeron-lanart.livejournal.com/20755.html) as that's the one with all the hand-wavy, plotty highlander stuff; everything else is pretty much character driven and based around Torchwood.