Is it easy to install a power socket in the boot of a saloon A4? I should be able to get a lighter socket from VAG Parts, similar to the ones used in the avant, but where can I wire it into? Is there any suitable power already in the boot or will I need to run something new? Just for the moment I'm thinking about hard wiring in (for charging purposes) a blue tooth GPS receiver which I want to sit on the parcel shelf, but may want it to power other things in the future. Kev.