5) Afterbirth, by Kameron Hurley
Martin Lewis asks if this would work for someone who hasn't read God's War buy the same author. I can only say that it didn't really work for me; I didn't quite get either the background to the story or why I was supposed to care about it. Important themes, good writing, but didn't really engage me. The only story of the five that I would rank below "No Award" (if the BSFA had that category, which it doesn't.)
4) The Silver Wind, by Nina Allen
A piece with rather interesting scenery, juxtaposing two alternative present-day Londons linked by a mysterious dwarf watchmaker. Lots of intriguing details which however didn't quite go anywhere.
3) The Copenhagen Interpretation, by Paul Cornell
A fantasy steampunk short in the same world as the same author's Hugo-nominated "One Of Our Bastards is Missing"; I enjoyed the pace and appreciated the basic concept, would have liked a bit more story, but decent enough.
2) Covehithe, by China Miéville
Originally published in the Guardian, of all places. Basically a very short piece about living, walking oil rigs. As usual with Miéville, gorgeous prose.
1) Of Dawn, by Al Robertson
Martin Lewis (and his commenters) complain that this story is variously too much like other recent British sf or too much engaged with its own internal references. I obviously haven't read enough recent British sf to get jaded with this kind of thing because I enjoyed it a lot; I thought the depiction of the central character's grief very true to life, and the layered delving into a personal and geographical past fitted the central premise in a way I found very satisfying. I would agree that it is perhaps a shade too long, but will put it top of my ballot anyway.