The number to call is 0800 953 0033, which should be free too. Quote reference M01W.
IMPORTANT NOTE: Unfortunately it is an offer ONLY for people receiving benefits or for elderly people. So if you fit into this category, you can give it a go.
Taken from the website:
''We have a limited number of PowerDowns to give away (RRP £12) so call 0800 953 0033, quoting reference M01W now.
This offer is courtesy of eaga and their energy supplier partners, as part of their commitment towards improving domestic energy efficiency in the UK.
The PowerDown is a unique product that automatically switches off devices linked to your desktop computer, such as printers and scanners. So you only need to remember to switch off the computer.
Helps to protect your equipment from power surges and voltage spikes
It takes seconds for you to install just plug it directly into a wall socket and then plug your computer and other devices into the PowerDown.
Please allow 42 days for delivery, offer is available to mainland GB residents and is strictly subject to availability.''