Recruitment of Black, Asian and other minority lawyers has helped about a dozen top law firms boost their ethnic diversity in the U.K. to at least 20%, according to research by Law.com International, but only two firms have reached the same benchmark in their partnerships.

A survey of 43 law firms found Boies Schiller Flexner, Irwin Mitchell and Sidley Austin had the highest proportion of BAME lawyers in the U.K., but only Latham & Watkins and Shearman & Sterling had partnerships that were close to 20% BAME, reflective of the national population.