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@On1
Generally speaking the amount of light has to be 15/20% minimum percentage of the floor area of a habitable room, so you'd probably need to have an open plan living room/kitchen then work out the overall floor area and see if the window will suffice.
Fire on the other hand I'm not 100% sure about check the approved document Part B, you also don't have to have to walk through the living room to get to the new bedroom just put a door close to the existing hallway and extend the hallway up into the livingroom slightly