I'm looking to install a socket to the ceiling to power a home cinema projector. I would be able to spur it from an existing wall socket by running the new cable behind wall up to the ceiling. A new false ceiling is being installed so I will be able fish it through to the location I need it to be. I have spur'd from other existing sockets in the past but I haven't done one up to the ceiling before. Just wondering if there are any special requirements I should be aware of?