Well now I feel dumb. :P
Got it working. Solder's all fine (spent a while with http://wiringpi.com/ to verify that.
Turns out that I needed to run the script from http://learn.pimoroni.com/tutorial/phat/raspberry-pi-phat-dac-install as root.
D'oh!
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pHAT DAC "no soundcards found"
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