Defined Technical Specs for 'Broadcast Quality' Does anyone know if there are clear technical specs a digital file can be assessed against to confirm a valid 'broadcast quality' file?

EG: Video = certain bitrate  Audio = certain bitrate.

Obviously 'non-broadcast quality' files can be faked by resaving to meet such specs, but as a starting point are there guidelines?
This depends entirely on who you are delivering to. Different broadcasters have different requirements.  Most have a delivery spec sheet that you can request, or that they publish online. e.g. here's the BBC one.