Fire Safety signs inaccordance with HTM 65 conform in every respect to BS5499 Part 1 and Internationally under ISO 7010 and when used in accordance with BS 5499 Part 4 can be determined as best practice for escape route identification, location and direction of egress.
Fire Safety Signs are an extremely important part of the communication strategy and Fire Safety management system. The main requirement of a good communication strategy is that it is understood by the selected audience otherwise confusion, misunderstanding and errors will occur.
This was clearly understood by NHS Estates and they tested their audience to ensure comprehension and decided as a function of their risk analysis to use the flame determinant to improve understanding and therefore effectiveness.
You can not escape these facts, signs to so called Euro Running man block of ice cream, Euro Directive, Euro Standard do not have any credentials whatsoever...they have all been tested and failed, failed miserably to be understood.
Under The Management of Health and Safety Regulations signs are required to instruct, inform, educate, locate and identify and as an offence under The Health and Safety(Safety Signs) and Signals Regulations it is an offence to use signs of poor design as they cannot be understood and therefore cannot satisfy the requirement of the regulations.
If you value you your judgement and you value you your own risk assessment which states no lesser standard is acceptable you will specify signs inaccordance with HTM 65. Why not it doesn't cost any more to use signs people understand rather than chose signs you know they don't.