You guessed it. Hayes actually submitted as evidence a UBS instruction manual on rigging the rate. http://www.bloomberg.com/news/articles/2015-06-18/ubs-gave-o...
"The document [that Hayes points to] instructs Libor submitters to clear their judgements on the rate with certain named traders. Defence lawyer Neil Hawes last week suggested the traders held derivatives positions dependent on Libor."
http://www.risk.net/operational-risk-and-regulation/news/241...