Blacksod is not an oil rig or platform.
It it an on shore landing site that is used frequently as a fueling point by CHC Irish Coast Guard Crews.....often while SAR Operations are on-going.
The Operator knows landings there will be necessary during adverse weather and at night or both.
Commonsense alone....tells us there should be Weather Minima set forth for flight operations even for SAR Operations and a formal Approach Procedure should be documented for use by CHC crews that adheres to the policies and procedures set forth in SOP's and the AOC.
Even SAR Ops have real weather limits as at some point the aircraft has to be able to carry out the Task and safely return.