Very rambling but it appears to me a basic question, When a new BS or Standard is published do we have to scrape what we have in place today and start again, simple answer no, unless it's a retrospective law, signage is a small but important part of the whole safety system, and while it’s clearly profitable business practice to recommend replace, are the people who make such recommendation practicing what they preach, i.e. have you removed your fire detection and alarm system and replaced it with a full complaint BS 5839 2002 system, have you demolished and rebuilt the parts of your buildings that don't comply with the current building regulations, clearly not, should you replace your signs because they are not the most current version No.
Building which are new or refurbished clearly should meet the standard in force at the time of the work.
