All one essentially needs is a relay and some wire. Cut the wire off
the relay coil and rewind using thick wire. Now put the relay coil in
series with the PC's mains feed, and use the relay contacts to switch
the live that goes to the peripherals.
You could enclose it inside one of those 6 way socket strips, cutting
one of the strips to give the 2 separate circuits. Then to use it you
plug PC into the first socket, and that controls power to the others.
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