OK...here's the latest. I have a couple more bits now including an Appliance Module. So now we can turn on/off the baby walkie talkie transmitter from downstairs...
I had been trying for a long time to find a source for UK compatible X10 units. Suppliers that had previously sold them had stopped due to a problem with CE markings not being on their units. However eventually I found out about Laser Business Systems Ltd who are selling them RIGHT NOW...