See the attached picture. In the trunk there are two panels that fold down, one on each side toward the rear of the trunk. They both have a black plastic handle on them. Pull out toward the center of the car and they will pop out and fold down toward the center of the car. In US models, the amp and CD change are on the driver's side (left), battery and fuses on the passenger side (right). I don't know if this is reversed in UK models, and your info does not give a location, so I don't know where you are. The correct side you fold down will have a fuse guide paper pasted onto the inside of the folded down panel.