Thanks for the suggestions. I know I've loaded the firmware correctly. I find selecting the poor digital source option results in unacceptable "popping" when changing channels etc.

I'll have to look into confirming the sky software but for now I've gone back to analogue inputs.

I'm pretty dissappointed with Meridian on this. It used to work fine for me with a Sky box and it hasn't ever since they made a firmware update.