Mayer Brown and Stephenson Harwood have taken roles on the largest flotation of an oil and gas company on the London Stock Exchange – by finances raised – in the last five years.

The complex deal, which took almost two years to complete, saw Eland Oil and Gas raise £118m on its Alternative Investment Market listing, enabling the company, in a joint venture with Starcrest Nigeria Energy, to acquire a 45% stake in the onshore Niger delta oilfield Oil Mining Lease 40 (OML 40) for $154m (£97m).