Tony, the front door is solid wood, and conforms to a 'fire door'. You are right about the stone staircases, they are not fully enclosed. People can run up or down the fireproof stairs to different landings and each landing has a staircase on each end. There are no doors on any landing or staircase. The best in fire provision. External to the flat in the building is not an issue here.If your block is the old type of tenement block, with open staircases such as this one, then you might be OK as long as any flat door opening on to the staircase has a fire door.
The problem with the Approved Doc is that it seems to assume that stairs to flats are enclosed; if they are open and the chance of smoke build-up is far less, they are probably equivalent to external escape stairs.
It will be down to risk assessment, as woody pointed out. So far as your internal layout only is concerned, you almost certainly comply, if this type of staircase is accepted as providing adequate safe space (ie equivalent to being in the open air).
Ah, someone agrees with my interpretation and that the internal flat layout complies with the regs. Those who wrote that I was wrong have not come back to point out in the text and diagrams that I am wrong.
This is an issue that creates great confusion, at least some builders can see through it now.
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