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If you have continuous flights does the continuous handrail have to extend at least 300mm beyond the first and last nosing at the central well of the staircase, as it would for a single flight staircase?

An ambulant disabled person should be able to hold a handrail for support either before taking the first step up or down or after reaching the landing from the last step in a flight. That should normally be possible where the handrail continues around the central well of a stair without further extension onto the landing, particularly if the handrail continues in an unbroken radius.