Some time ago the British car manufacturer, British Leyland, was accused of operating a "slush fund", and of other questionable practices such as paying agents and purchasers with padded commission, offering additional discounts and making payments to numbered bank accounts in Switzerland.

【翻译】一段时间前，英国汽车制造商英国利兰公司被控经营一家“行贿基金”，以及其他可疑的做法，比如向代理商和购买者支付高额回扣，提供额外折扣，以及向瑞士的黑色银行账户付款。

pay sb. with sth.：以.....形式向某人付款。

paying agents and purchasers with padded commission：向代理商和购买者支付高额回扣。