I have a fairly wide in places trench to fill in all around the house that was excavated for the foundation. Want to put a couple of French drains in the uphill side of the house as rainwater is collecting here. And I need to leave room for surface water pipes nearer the top. What material should I use to fill in with? 
There are a couple of areas, Front Door, Garage Entrance, Patio and Heat pump slab which also will need a solid footing under them. 
I have plenty of spoil saved from the excavations so can fill the further away from the house part of the trench with this.

Was thinking a vertical geotextile membrane to seperate and build up in layers?
 

 

My trench next to the foundations were filled with 50mm drainage stone to act as a French drain due to a high water table, this was extended to a roadside ditch to reduce the water levels.