2000 Renault Megane cigarette lighter broken?

I tried to put my satnav into my cigarette lighter a few weeks ago but it wouldn't go in properly. When I pulled it out a spring fell out of the ligher fitting and what looked like a small fuse... now it won't work. I also have to manually turn my radio on and off instead of it being activated with the ignition key.. is this related? Does anyone know if the cigarette lighter fitting is fixable and if so is it expensive?

Jo Souter
January 2012