Ropes & Gray‘s newly-launched London practice has secured a trophy mandate after being instructed to advise cable group Liberty Global on deal finance for its 3.5 billion euro ($5.2 billion) takeover of Germany’s Unitymedia.

The U.S. law firm was instructed two weeks ago to handle the high-yield debt backing the acquisition, one of the largest media deals since the credit crunch crippled the leveraged finance market in 2007.