PhilB, You seem to get the point I'm making.
I have undertaken a number of mock evacuations in care homes and this problem arises on a number of occasions where I deliberately block the 'access' space saying its smoke filled, leading to a final exit fitted with just a push bar .
The staff are absolutely stumped on how to gain entry to the 'safe' space via a final exit that is fitted with a push bar which in most cases cannot be opened externally. Where this situation may arise, where it often does, I strongly recommend an external lock also on the door. Ok, not ideal as it may require a remote key or other method.
My point to others is that just a push bar accords with the codes, which can fall short of suiting all situations. And why do you need a push bar on a final exit in a care home where only a very small number of residents and staff may use it. They used to be called 'panic bars' remember. Fire risk assessments in care homes are not a matter of just ensuring the codes are met but looking at the logistics and the ability of evacuating elderly infirmed people.