efff me....22 pages of (Australian narrow minded BS) with lots of if's and but's...please keep it simple...
IF there was no fog on the ADL TAF the crew used for their fuel decision and IF the fog rolled in after dispatch and IF ADL had full CAT3B the only excitement of the day would have been a beautiful autoland and maybe a loooong taxi to find the gate "Delhi style"...that's it.
Please keep in mind that after dispatch you only require to show landing minima at your destination (and CAT3 minima can be applied - the minima is irrelevant at the alternate after dispatch).
At my home port (HKG) we got CAT3 and we haven't had any fog in 3 years or so - so frequency of weather or lack of doesn't justify not installing the appropriate equipment.