Apologies for my brain explosion, i've worked out a better method, this works if anyone else needs it!
DLookup("[ConfirmedLoad]=0", "qryDriver4a2", "[StateID]=" & Forms!frmLoadAllocation!txtState & " And DeliveryDate=#" & Format(Forms!frmLoadAllocation!cboAllocationDate.Value, "mm/dd/yyyy") &...