The ECJ has undermined the use of salary sacrifice schemes, by saying that VAT has to be paid on the value of vouchers provided to staff.
Salary sacrifice schemes are based on employees sacrificing part of their salary so they no longer receive it as money, but instead are given benefits (eg childcare voucher, gym membership, car). Although the employee will be taxed on the value of the benefit, there will be no NI payable by the employee (or by the employer).