For those that are interested I bought one of these couple of weeks ago.

http://www.ps3toothfairy.com/

Turned up yesterday and I installed it yesterday afternoon.

Works beautifully.  I can now turn the PS3 in my home theatre on and off, and control all the functions from my Harmony remote and thereby consign my PS3 remote for that room to history - what a difference being able to have a lit remote control - no more fiddling around in the dark