Simon Robertson, the former president of Goldman Sachs in Europe, lifted revenues by more than a quarter to £1.15m (€1.7m) at his eponymous corporate advisory boutique last year, taking advantage of the booming market in mergers and acquisitions.

Robertson, 66, increased revenues by 26% in the 12 months to the end of March from £914,000 in the boutique's first eight months of operation. Profits remained relatively flat, rising 3% from £663,000 to £680,000, according to filings at Companies House.