Citroen C1 Leaks & Noises Problems

rain in boot

The rear brake light fitting is holding rain water and literally pours out after a downpour, when set off driving, so much that it can cause multiple tracks down the screen that have to be cleared with the wiper. The dealership from where ...

my radio is permanently on even with the key out and all the buttons are unresponsive, has anyone else had this problem or know how to fix this?