Hi Niallo, my wife has a 206 also and the same thing was happening to hers, she too drove it very little. Eventually, after replacing battery and bringing it to Peugeot the problem was that there was a pen stuck beside the hinge on the glove box. The glove baox closed without a problem but the interior light stayed on constantly and was running down the battery, have heard of something similar happening on the boot also, so you might wanna check these silly things before bringing it into a garage.