I agree that normally this would not be considered good practice on the proviso you have Fire Wardens on each floor.

Generally you would expect a Fire Warden to carry out their responsibilities as they are making their own way out of the building and they should not expose themselves to a greater risk. Hence in many offices you may have multiple fire wardens on each floor who would clear their section then get out of the building. There will always be exceptions but expect these to be risk assessed and controlled to the hilt.

It depends on the circumstances: If there is an obvious fire ie smoke etc then, I would not expect fire wardens to move towards it (unless they were helping some who was mobility impaired) but rather to make their own way out and whilst doing so clear the area on the way out. On the other hand if the fire was an alarm only one with a sensor in locked room , behind panelling or in roof void then someone would need to go and have a look to confirm that this was a real fire not just a false alarm . That is what we did in my last place of employment, as unless a real person confirmed that this was a fire the fire brigade would not treat it as a proper alarm. Activation of the fire alarm points counted as a real alarm.

I agree, which was my original point, a "know all" colleague thinks otherwise. In our buildings I am looking at having 3 for each floor (1 being a deputy). Its simple, clear your area, get out, report to the incident controller.