...curious, what car is this? I have actually never heard of, nor seen a caliper with an electrical sensor, the pads generally have a metal "sensor" like I described above... Can you get any pictures for me?
I only described the above to give you an idea of what CAN cause un-even wear on pads....
Though, I am rather interested to hear if a typical consumer car from the UK has electrical sensors for pressure, and pad levels... My car has 3 brake lights, one for ABS failure, a RED one for general "OMFG FIX ME!!!" then another one that isn't factory, supposed to sense the heat of the fluid in various locations, though, that has never worked as the sensors aren't in the lines... xD