Did Brian's exit happen last night?
 

Just watching the two clips on the BB app with both Helen and Brian's argument and then Nick comforting Nikki after Brian has left. Helen is wearing the same clothes in both, and it's the same time of day in both. This kind of confirmed that Brian argued with Helen and then left on the same night.

http://i.imgur.com/a0EBdqz.jpg http://i.imgur.com/8sy0QOE.jpg

In which case, why has it taken Channel 5 so long to tell us that Brian has left? They should have told us a lot sooner.

I think we already knew that dear

I am sure Brian Himself controlled that
as he wants paying etc

maybe they were hoping he'd change his mind and stay?

This.

They probably asked him to sleep in the bunker again for the night.