You can usually take up to 2 cars on the Scheme, subject to your company’s approval and provided that your gross salary does not fall below National Minimum Wage after all salary sacrifice deductions.
If at any point your salary does reduce below this level, the company will no longer be able to make the usual salary sacrifice deduction from your gross salary, so you must either (A) agree to a deduction from your net salary, (B) reimburse the company from other private means, or (C) return one of the cars.