Thanks to Barnaby and Peter's postings on Arduino.cc I've managed to build an Arduino sketch that will send On/Off signals to a HomeEasy HE302 socket via a little 433 mhz transmitter.
This code takes a HE device code (6 digits) and sends an on signal, then an Off signal.
Code is here, If you want to build this, you just need a little Arduino board, and the 433mhz transmitter I talk about in earlier posts.
Now, go forth and build my friends 8-)