Hi, There is no back light cover you have to remove the whole unit and then remove an insert from the back.
To do this you will nead to prise out the blanking plate in the rear pillar ( use a sharp screwdriver with a cloth wrapped arount it ) once removed you will need to remove the bolt. There is also another bolt that can be found behind the carpet in the boot below the parcel shelf. The carpet should be pre cut to allow access. Once the two bolts have been fully removed then you can just pull the whole light cluster off, this may need a small amount of force as the pads they use to stop them rattleing can stick a little. Once light cluster has been removed then the rear plate can be unsrewed and the bulb replaced. Putting everything back is just a reverse process.
Richard
June 2007