I understand you add 200ft to DH and 800m to VIS for a PA and for a NPA its 400 / 1500m for the planning stage to consider it as a ETOPS enroute alternate Aerodrome.
I have been looking at Ryanairs OFP lido planning and they use for example EICK for a suitable airport and apply the above increments to a PA ILS CAT II
Can anyone confirm you can apply it to any ILS approach? I always thought it needs to be CAT I