White & Case‘s London office has emerged as the worst performing U.K. arm of a U.S. law firm in 2009 — a year in which results varied significantly between firms.

White & Case saw London revenues plunge by just under 20 percent to $197 million (130 million pounds) during the 2009 calendar year, with profits per equity partner dropping by 11 percent to $1.32 million (872,000 pounds).