this is serious stuff.
Sure is. My company has bought a british company in 2007 for 13bn€ IIRC. (most assets of said company in US & Australia, however...)
My bosses are seriously concerned if brexit becomes real. Asked the CFO what he figures the consequences are. Basically, he said, no one really knows yet, but it will hurt the economies on both sides. big time.
We will find out.