That's the problem with knowledge, hard to turn off :-)
I'm not a fire professional, but rather a business owner trying to grapple with the issues at a practical level. In a previous life I was a theatrical lighting designer and producer, and involved with lighting museums, so nowadays I can't go to a theatre without looking at how the show is lit, or visit a museum without examining the picture-hanging technology. Right now I'm doing plans for our new building, and hence grappling with Building Regs, British Standards, etc., and in consequence I find I can't watch the TV any longer either...
I'm posting a separate question regarding "inner rooms", since this is a problem I'm tackling right now and the regulations don't seem to make it clear!