My 206 is doing it too...a short 1 second beep every minute or so. That's because the ECU is recording lots of error codes (which I know it has at the moment due to a very knackered ECU). I could be wrong, but I'm willing to bet that's what it is. I would get someone with Planet to look at it.
Hi, I have an automatic Peugeot 107, and my car has just started making a beeping noise only when I drive at night, no warning lights are coming on, also feels like at times it’s struggling to get power?