Simon Robey and Simon Warshaw have pulled off a stunning coup by landing a role advising BG Group on its recommended acquisition by Royal Dutch Shell, beating the company’s corporate brokers to the mandate on what would be the biggest ever takeover of a UK company.

London investment banking boutique Robey Warshaw, which is run by ex-Morgan Stanley banker Robey and former UBS adviser Warshaw, is advising BG on the deal alongside Goldman Sachs.