Generally it is quite difficult to fund start up businesses as there is no security or proven cash flow history. Lenders would usually require some sort of collateral security (such as property or vehicles) to fund a start up business.
Invoice finance can be a good option for a start up business as it will grow as the business grows.
Good credit is absolutely required for an unsecured loan. A few blemishes are okay for other loans provided that they are paid off prior to settlement.
Defaults to other finance companies will generally lead to a decline unless they were paid some time ago.
If there has been a liquidation or a recievership in a borrowers past a loan may still be considered provided the loan is not ongoing.
Ex-bankrupts that are proving their worth can be considered.
Invoice finance, secured loans and guarantor loans are best suited to borrowers with a blemished credit history.