I bought this this Zyxel twin pack Powerline Ethernet Adapter for a project 1 year ago at £85. It is very reliable and truly plug and play. Now, it is only £35.24 + delivery at Scan.
Not sure if the Scan-Avforum free delivery still applicable.
The ZyXEL Powerline is an extended access solution that allows your business or residence to be completely networked with existing power lines, with no need for additional wiring, simply connect the ZyXEL Powerline PL-100 to an existing power socket, and it will transform your electrical power lines into a network infrastructure. Its the easy way to allow data and power to share the same power socket and as its desktop mounted there are no issues the Mains Plugs not fitting.
Twin Pack - Ideal Starter Pack
Up to 85Mbps-Equivalent Data Rate over Existing Power Line.
Great for extending a Wireless Network.
Ideal for audio and video streamind
HomePlug 1.0 Certified
56-bit DES Protection for Secure Networking.
Stylish Desktop Design.
Supports up to 16 (Tone Map)PL- devices communicating on a single network
Each Powerline Ethernet adapter supports 15 remote Ethernet addresses. With total 4 groups then it can support up to a total of 64.
OFDM Symbol Modulation,
Supports QAM 256/64/16, DQPSK, DBPSK and ROBO Carrier modulation schemes
Frequency Band: 4.3 MHZ ~ 20.9 MHZ
Coverage Area: up to 300 meters/984 feet