It really depends on how they have their email set up. Given the...

It really depends on how they have their email set up.

Given the incestuous relationship between all of the entities, it would be very cumbersome for Captain Carpark to have one mailbox for each and every company he's a director of. He would be constantly checking a multitude of different mailboxes.

The more likely scenario is that each person has one mailbox with a bunch of aliases attached to it. This would be easier for them to manage from their side but it also means that it BHD, HML and JBL emails would all be mixed together. Emails that I have received from them in the past suggest that it is actually set up this way.

Getting access to their emails will most likely require a court order.