I have now got my LED lighting installed in my flat, so far there have not been any problems with latency or heat dissipation which were the two things likely to be a problem.
There is now an Instructables write up of the project here.
Here is a video of me testing the setup using my Android application:
I will see how well this continues to work, but so far am happy with this setup.
More details on the controller and web/Android apps can be found here.