Quinn Emanuel Urquhart & Sullivan’s London arm saw cash revenues rise to £27.5m last year, a 20% jump on the fast-growing firm’s 2011 figures.

Richard East, the co-managing partner of the ten-partner City base, estimated that 67% (£18.4m) of 2012 revenue was profit, an increase of 16% on the previous year’s figure of £15.9m.