If you are searching for Black Box Car Finance No Credit Check, then, unfortunately, your search will not bring up any legitimate results. Every car finance provider in the UK has to complete a credit check to ensure anyone they offer finance to has the affordability to maintain the repayments.
Several car finance providers used to fit a black box (or immobiliser) when they financed a car, so they could locate the car should they need to repossess it for non-payment. There are no finance companies that fit these black boxes any more, they simply rely on good decision making to maintain customer payments.
See also, No Credit Check Black Box Car Finance