Yet another Fabia Easter Egg struck, in the form of the fan resistor pack failing on my vRS. So here's how to fix it. Part number is 6Q0 959 263 A. The guy I get parts from at TPS reckons they sell one or two EVERY DAY, and VW have hundreds at the central depot at any given time, so that gives you an idea of how common a problem this fault is!
You'll need a T20 Torx bit, and possibly a flat-head screwdriver depending how small your hands are:
open the passenger door and the glove compartmen