Waste management company Biffa is suing former employee Christine Wilkinson in the High Court after paying her by mistake for two years. Biffa carried on paying her salary for 26 months after she left on April 5 2005 a total of £26,989.56 - without realising its mistake, according to a High Court writ. But when the company asked for its money back, she failed to reply Biffa claims. It is suing Wilkinson, of Enfield, Middlesex, for repayment of £26,989.56, as well as interest running at £5.91 a day. Biffa said it continued to pay her salary directly into her bank account after she had left, and did not notice its mistake until June 2007, when it immediately stopped. It also sent her monthly payslips, but despite this she did not alert the company to its mistake, or arrange to repay the money. Biffa wrote to her on July 3 this year, asking her to get in touch with proposals to repay the money, but she did not reply. The company then instructed inquiry agents who confirmed that she still lived at the address, and its solicitors wrote on August 6, formally demanding repayment of the money, and threatening legal action if she did not reply. Despite this, the company claimed that it has heard nothing from her. Biffa accuses Wilkinson of being unjustly enriched by the company, and says it is entitled to repayment.