On another note
Why would the invention of the intumescent strip and smoke seal now require us to change policies from stay put to an evac in sheltered blocks (or any others)? The 'stay put' policy has worked fine in the years up to this point so why the need to change it now?
Its an urban myth that the fire service is trying to change stay put policies
As you correctly point out stay put policies were in existence before intumescent strips and cold smoke seals became available. What Inspecting Officers, Risk Assessors, RPs should be looking for is good unbreached compartmentation.
Without the correct level of FR / compartmentation a stay put policy can not be entertained. This encompasses several aspects of passive and active fire precautions, not just strips and seals on doors, but the integrity and condition of compartment walls / true lines of Fire Resistance for example.
So I dont think its fire service losing faith in stay put policies, instead I think its more a case that they are looking more closer at it.
Another consideration is the management or marshalling of fire evacuations. We are seeing many schemes now without any staff on site. That has to be factored in for several reasons too.
We could all drive cars without seatbelts some years ago, then it was enforced that we should wear them.Why? because they give occupants enhanced protection.
Its the same with strips and seals; they are an additional safety measure which gives enhanced protection.
So if a door hasnt got them but needs them an inspecting officer will ask for them to be fitted.