haptism
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See 1.13 of said document which I think you have done where circulation space is referred to and although strictly speaking this does refer to hallways and landings the wc has allowed the extension to become so and hence linking is required. I am somewhat surprised the wc location was approved without a door in the new extension to lead to a place of safety.
There is a door leading out to the garden in the new extension, as well as patio doors round the corner. I did not draw them in the sketch.