It is a 500 gb box, I'll have a look tonight. I thought I'd be able to find it via the service menu but the model number on there was the same as the software verion number
This should be in the Remotes forum, where, coincidentally, it's just been answered.
They all use the same commands so model numbers don't come into it and you simply select the default entry at: Add Device> Video Recorder> PVR> Sky which is actually the same as Scotty Pro's.