This useful little multi-plug adaptor costs around 16 pounds and takes the nuisance out of switching all your electrical equipment off at the wall. Plug your computer into the master socket, and anything connected to the other sockets will be turned off when you shut down or switch off, and turned on again when you fire up your computer. It also works with hi-fi, TVs and energy-hungry set-top boxes.
There is a cheaper option as well: spend a few seconds to turn off everything at the wall. Use a multi-socket adaptor and you could shave seconds off by only needing to flick one switch.
From: How Can I Stop Climate Change. Friends of the Earth.