Allen & Overy (A&O) and Skadden Arps Slate Meagher & Flom are advising on the £9bn sale of UK payment processor Worldpay to US rival Vantiv.

A&O is advising Worldpay with a team led by corporate partner Duncan Bellamy, who advised the company on its £890m initial public offering (IPO) in 2015. M&A partner Seth Jones is also advising on the sale.