Easy..
Rent a wall chaser to cut a channel in the wall from where the new plug and light switch will be up to the ceiling.. make sure you get a hole through into the ceiling.. chisel out a 4x4 and 2x2 square/rectangular hole for the light and plug switch wall boxes..
Now you can get some 20mm conduit and a 2x2 and 4x4 wall box and pop them in the wall and fill with plaster..
Depending on whether you are moving closer to the DB board, you could use the existing wires for the plug and light switch.. either way, probably best to get an electrician for this part..
Replace wall chaser with hammer and chisel, or a hammer drill with a big masonry bit or a rotary hammer drill with a chisel attachment, as other options for cutting your channels..
Oh, hope you love dust...