LionTree Advisors, the US boutique set up just months ago by the former head of Americas investment banking at UBS, has secured by far its largest advisory mandate to date with a role on the third-biggest takeover of a UK company since 2000.

LionTree was set up last summer by media banker Aryeh Bourkoff after he quit UBS in April, according to The Wall Street Journal's Deal Journal blog at the time. Bourkoff had been head of Americas investment banking at UBS since March 2011 and before that he was the bank's joint global head of technology, media and telecoms.