I've read this thread with interest and thought I'd let you know how I've got on with a Powermid IR - RF Transmitter and Home Easy sockets this weekend.
I want to control the switching on and off of a 32" LCD in the bedroom and a DVD player while in bed, I know, I'm lazy. The sockets are behind a chest of drawers so its a bit of a pain reaching round the back to turn it on/off each night. After reading up on my options I decided to by a Powermid IR - RF - IR Transmitter and Receiver pack and some Home Easy sockets. I obviously could just use the RF remote supplied with the Home Easy gear but think it would be much simpler if my universal remote could do everything in one.
The short answer is that it works

, but it was a bit fiddly to get it working. First off I tried setting the Home Easy socket to its learn mode, pointed an old remote for a video recorder I don't use anymore at the Powermid IR to RF transmitter and pressed a rarely used button. The Powermid Transmitter flashed to show it was forwarding the signal but the Home Easy socket never responded. I hoped the Home Easy socket would respond to any 433MHz signal but it seems not.
I then started wondering whether the Home Easy sockets only have a set few signals that they will respond to, and how to work out what they were. It was then that I realised I might be able to use the Powermid RF to IR Receiver to teach my universal remote one of these signals. I set the universal remote to learn and pointed it at the Powermid RF to IR Receiver and then pressed the first On button on the Home Easy RF remote. It took a few attempts but in the end I managed to capture the IR signal on the remote. I then captured the first Off signal in a similar way.
Setting the Home Easy socket to learn again I pointed my universal remote at the Powermid IR to RF Transmitter and sent the captured On signal. After a few seconds the socket responded and sync'ed up.
You do need to keep the universal remote button pressed for about 3 seconds for the socket to switch on and about 2 seconds for it to switch off but it does work. I've also noticed that you need to point the remote pretty acurately at the Powermid Transmitter for it too work aswell, but as i've only had the Powermid units for a couple of days I'm not sure if thats how they are in general.
I would suspect the Home Easy lighting gear would work exactly the sameway.
Now I just need to wait for my Harmony One to arrive from Amazon and I can ditch the Mosaic.
Hope this info is of some use to someone, and apologises if i've hi-jacked your thread, but I was so pleased to get it going I wanted to tell someone about it.