In the event of missed approach
You dispatch with alternate fuel but if you hold long enough you have to commit to alternate fuel.
If you were to get close to minimum fuel once committing to No alternate
Lets say Final Reserve plus fuel for a go around 600 kgs and 1200 kgs final reserve ( 30 minutes ) thats 1800 kgs
If you had to not wanting to be in that place at all., as a scenerio
You would declare prior to in the event of missed approach Fuel Mayday as you would be in danger of going into final reserve then ?