AIP ENR 1.5 – 7 para 1.10.1 note 2: “If the missed approach climb gradient cannot be achieved the DA, MDA or RH should be increased, or other action taken to achieve the required obstacle clearance along the specified missed approach flight path.”
Quite clear really……….
However AIP ENR 1.5-2 para 1.6 states “EXCEPT IN AN EMERGENCY, (my capitals) an aircraft must not land or continue an approach below the approved DA, MDA or RH at any aerodrome where any element constituting the meteorological minima is continuously less than that prescribed rof that aerodrome and the particular operation”
Read into that what you will.