Hi Walter, from Jarops.........
" If an in-flight fuel check reveals that the expected fuel remaining on arrival at the destination will be less than the required alternate fuel + final reserve fuel (i.e minimum fuel) the commander will :
(a) assess and take into account the traffic, operational and meterological conditions prevailing and expected at the destination aerodrome; and
(b) similarly along the diversion route to the alternate aerodrome; and
(c) similarly at the destination alternate aerodrome;
when deciding whether to proceed to the destination aerodrome or to divert, so as to land with not less than final reserve fuel."
So although you are "expected" to have minimum fuel at MDA/DA at destination, under Jarops YOU decide what to do and where to land as long as you don't land with less than final reserve fuel (i.e 30 mins holding @1500ft). If you reach Emergency fuel level (different for each type) you must declare a Mayday.
Hope that's of some use, and here is the link to the Jars site, there's alot of it
http://www.jaa.nl/section1/jarsec1.html