The British arm of Deloitte is announcing a “first of its kind” alliance with U.S. immigration law firm Berry Appleman & Leiden, as the Big Four accounting firms continue their push into legal services.

In addition to the alliance, which gives BAL access to Deloitte’s scale and expertise outside of the U.S., Deloitte UK will acquire the law firm’s non-U.S. business, which extends across eight different countries.