Soldato
I'm going to guess the occupants of the other offices and the shops give no *****, nobody knew what to do and it was nuts, one guy finished his cigarette and went back in, lol.
Am I right in my assumption that my boss should do a fire assessment of our office and everything else and be responsible for his staff/office?
Get in touch with the local fire brigade or H&S at the local council, raise your concerns and go from there. The Fire brigade are keen to tackle this and have departments designed for training/assessment of premises and their procedures.
You could go straight to the HSE with your concerns. http://www.hse.gov.uk/