Arriva North East put something out earlier, which isn't exactly confidence boosting:

"We’ve had several queries regarding our dedicated school bus services, so we wanted to reassure you that we are working in line with government guidelines, students should socially distance on the bus, if there is space to do so, if not, students can use all the available capacity on the bus, as they would pre-covid. Social distancing still applies when boarding and alighting, with non-exempt students over 11 required to wear a face-covering. We thank you for your cooperation."

https://www.facebook.com/arrivanortheast...2494006173

It's no wonder people are confused! If I had kids, they would not be using a scholars bus 'as they would pre-covid', knowing how packed some of them become. It's as if social distancing has now become an aspiration, rather than a requirement. 

n.b. before someone points it out, I know it's in line with the DfE guidance - but that doesn't make it the right thing to do.