Boot / Trunk light

This is probably a dumb question, but I need to replace the trunk light, but I've never taken notice where it's situated. Can you tell me where to look? Also, I will need to replace the fuel pump (accessed via the boot to the fuel tank). I've had different versions on how to doe this. Is it straight forward unbolt & replace, or do I need top drain the fuel tank first?

Thanks for any help.