Have tried a few codes from the Hitachi website now and still no luck. I fired off an email to [email protected] and got the unhelpful response "I am sorry to advise that I am unable to make available any discrete IR codes for your Hitachi L42VC04 TV."

I will try some more codes at the weekend, any suggestions welcome (for HDMI 1, HDMI2, AV1, power off and power on)