My room would fail building regs for the same reason. I am concerned about it, and I was watching the build of a really good cinema installer on youtube, and they worked in a room which would also fail for the same reason. The room only had one means of entry/exit before the company installed a cinema, so it wasn't their fault, and I guess if they're not changing anything structural then they don't need to think of building regs.I had to have a window for the same reason. I built stud framing and openable panels Details in my build thread in my sig below.
I really don't want to fix the issue, so I'm planning extra smoke alarms and fire extinguishers to lessen the risk.