Thanks.
It's had to go on the backburner for now, unfortunately - Life's what happens to you when you're making other plans and all that.
But, it's given me some time to investigate other things - notably: A-State, Between Dreams, Daddy Issues, Deliria, Dreampunk, Dungeons & Dayjobs, Everywhen, Ex Machina, Insylum, Invisible Sun, Itras By, JAGS Wonderland, Juggalo RPG, King of Nothing, Lacuna, Liminal, Lords of Gossamer and Shadow, Midnight, Mirror Mirror, Narcosa, Never Tell Me The Odds, New Gods of Mankind, Nightbane, Postcards From Avalidad, Ptolus, Reaching In The Dark, Scion, Sins, The Machine King, The Yellow King, Toypocalypse, Underworld, Unknown Armies, Urban Faerie+Chav, Urban Jungle and Vaesen.
Not everything will make the grade, but there's enough amongst them to have given me some ideas for the underlying rationale and plot development as well as some new mechanics - when I have time to focus on things again, there's a highly significant twist to the tale that has managed to consolidate the most significant thread to it all (think Clive Barker if he weren't such a cheerful soul ; ) [1]
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[1] The idea is that it should be to Barker what the original UK series Misfits is to the superhero genre - twisted. So, it will be not just dark but very ... very ... wrong - Cf. the difference between Gibson's vision of the world of Neuromancer and the brutality of Jack Womack's Ambient/Dryco series (only in an urban fantasy setting).