Having flown into cork on many occassýons on different aircraft
from shorts 360 to a321 I dont think that having a cat 3 ils will solve all your problems.
Firstly,on a number of occassions the crosswind is outside of limits for a cat 3 autoland.
Secondly the runway length can make an autoland on a wet
runway with little or no headwind in a heavy a321 interesting.
and most importantly,the topography of Cork is its biggest problem.Cat 3 autolands need an accurate radio altimeter reading.
the undulating ground on both runway approachs but in perticularly the main rwy 17 prevents it from being suitable for cat 3 unless radar reflectors were installed with its added cost.
By the way there is no cat 3 runway at Shannon just one cat 2 runway.Shannons secret is its evevation 50ft compared to Corks 500ft