Slaughter and May and Simpson Thacher & Bartlett have won lead roles as FTSE 100 engineering business GKN rejects a £7bn bid from Melrose.

The magic circle firm is advising GKN with a team led by M&A head Roland Turnill. In 2015, Slaughters acted for the company on a £200m share placement.

Simpson Thacher is representing manufacturing turnaround specialist Melrose, with London M&A partners Adam Signy and Ben Spiers leading its team.

Today (12 January), GKN revealed that it had received an unsolicited offer from Melrose to acquire the company.

GKN said in a statement that having considered the proposal with its financial advisers, it has unanimously rejected the offer, describing it as "opportunistic" and stating that it undervalues the company and its prospects.

The announcement came as the company appointed Anne Stevens as chief executive and announced its intention to restructure the business. GKN is divided into multiple sectors, including aerospace, automotive technology and engineering solutions.

Slaughters is currently advising Carillion, as the Wolverhampton-based construction company fights for survival after multiple profit warnings.

Meanwhile, Simpson Thacher is acting for 21st Century Fox on its near $15bn (£11bn) takeover bid for British satellite broadcaster Sky. The US firm is acting alongside Skadden Arps Slate Meagher & Flom and Allen & Overy on the deal.