Nice and cheap powerline adaptors for networking. Seem to be around £45-£50 elsewhere.
Advanced HomePlug AV2 Technology
The D-Link PowerLine AV2 1000 Gigabit Starter Kit (DHP-601AV) delivers the ultimate in wired connectivity for the hard-to-reach areas of your home. Utilising your homes existing electrical wiring as a reliable high-speed network, the DHP-601AV makes it easy to connect computers, gaming consoles, and media players to your network without additional cables. The DHP-601AV is the ideal solution for getting connected in spaces like offices, bedrooms and other areas of your home that are remotely located from your router.
How does it work?
PowerLine gives you the flexibility to create the network you need in the space you have, by using your electric wiring to connect computers and other devices. Its a simple solution to what can be a sticky networking situation.
Hassle-free plug and play installation, plugs directly into a power socket with no additional cables required. This adapter implements 128-bit AES data encryption at the push of a button to protect your network from any intruders.
Power saving mode
Automatically places the adapter in sleep mode if no data transmission or reception occurs over a certain period of time, reducing power usage by more than 85%.
1 x D-Link PowerLine DHP-601AV - AV2 1000 Gigabit Starter Kit - bridge - GigE, HomePlug AV (HPAV) 2.0, IEEE 1901 - wall-pluggable
For those too lazy to read the comments, pavel76 says it's "£20.89 after vbox5 code"