Well the problem was a broken spring. Very disappointing concidering the age of them (less than 12 months)
It's too much of a pain to chase a claim (ie. wear and tear cough-cough bullsh1t).
This is on a street bike not a mountain bike, and my braking style is not aggressive, but how does one argue that...impossible.
The LBS was extremely helpful and we came to an agreement over a replacement, so I'm happy.