Thanks Boogieman,
I think you are right, camcorders may be the way to go.
I pictured sitting in a central location monitoring all the feeds (with two way audio) recording locally at desired times and transferring files up to an FTP ..then at the end of the day all 300 odd demos are uploaded and delivered for review..Rather than going back to edit out each clip from a camcorder x 20 rooms.. so basically workflow was the reason for streaming and recording to a central location.
But with consumer off the shelf hardware and software it's looking unachievable.
Many Thanks for your response.