Would like ability to charge interest on late payments based on tenancy agreement per tenancy which is plus bank of England base rate (which should be looked up from BOE so no need to find historic rates) and able to set when interest should be charged e.g give tenant 5 days allowance before interest is charged, given landlord flexibility to select nos days.  Interest charged should be viewed on tenants reports, have a column showing interest charged for each individual period rent is late and added to how much is owed, later give landlord option to waiver interest should one wish too