I worked for Peugeot for a year n a half. Lots of electrical problems with 206's but strangely enough, not really with GTI's. Weird.
They do suffer from the comms unit packing in. Really all it does is when you indicate then turn into a corner it doesnt cancel, instead it cancels then indicates in the opposite direction. Im sure you would get used to cancelling it manually after a while. Replacement units are about £230 fitted IIRC.
I had a girl in once who went from a 206 GTi to a 206 GTi 180. her complaint was that her GTi did 132mph but her GTi 180 only did 122
Imagine actually complaining about that. Eh wait till i phone the police love so you can tell him