The cure is
1/2 cup brown sugar
1/2 cup salt
1/2 cup maple syrup
Having reviewed the comments at Curious Kai I decided to premix the cure in the bag.
This is the raw pork belly:
This is the cure mixed in the bag:
This is the belly in the bag all nicely mixed up.
I also decided that I would store the belly in a clip lock container to prevent any spill issues.
Into the fridge with it and I will see how it looks tomorrow.