Assuming the Virgin/ Trenitalia operations are financially viable, they're proposing to use 200m trains, so on that basis you wouldn't need 800 people.
It's crayons obviously, but I think that if the HS1-2 link were to be built (so that's a no straight away), Birmingham to Paris/ Brussels/ Amsterdam ought to be able to support a 4-6 trains a day service across the various destinations. But then that's exactly why the link isn't happening, you'd never dig that tunnel for such a small amount of traffic.
It's crayons obviously, but I think that if the HS1-2 link were to be built (so that's a no straight away), Birmingham to Paris/ Brussels/ Amsterdam ought to be able to support a 4-6 trains a day service across the various destinations. But then that's exactly why the link isn't happening, you'd never dig that tunnel for such a small amount of traffic.