Mike,
Thanks for giving me the confidence to place emitters inside my equipment. I hate the idea of sticking things to the fascia of upmarket kit and if you have successfully put them inside the case around 1000 times then you are clearly a professional installer who knows what he is talking about.

However, I may not have to go down this route. After further investigation of RF options and after giving more thought to ways of screening the IR receiver from its associated IR transmitter to avoid potential feedback problems, I have just ordered a couple of Powermid Dual Power IR Extenders. These operate on an RF frequency of 433 MHz which I guess is unlikely to interfere with wireless Ethernet networks using 2.4 GHz. I will use one IR Receiver (RF transmitter) and two IR Transmitters (RF receivers) in our main living room and the spare IR Receiver in our main bedroom.