It's interesting that if the ingredients are in order of greatest proportion first that mustard is second in the list. Not a spice I would ever have considered to be a major player in a curry powder. And I wonder which type of mustard?
Struck me as odd too SS. I am only assuming that the Ing's are listed in order of proportion as they are required to be down here.
This pic is of the ing's listed for Kitchen King Masala Powder (Salt and Poppy seed not pictured). 1/2 Tbspoon of Yellow Mustard seed.

Try this out as a start point and tweak it.
Ga Lei Fan (Chinese Yellow Curry Powder)
1Tbsp each of Coriander, Cardamom, Cumin, Cayenne, Tumeric and Yellow Mustard powders.
Comparing this to Eastern Star:
chillies are replaced with cayenne,
salt, wheat flour and onion omitted (easy to adjust at cook time anyway or by playing with it).
Fenugreek and Fennel omitted.
Cardamom could be in the spices section.
Celery is definitely in Eastern Star so probably Celery Seed.
Lots of Spice Blends given here:
http://www.celtnet.org.uk/recipes/spices-recipes.php