Do celebs add value to a company’s board?

With U2's Bono and The Edge joining the board of guitar maker Fender, Lex's Robert Armstrong and the FT's Peggy Hollinger discuss whether adding celebrities to boards is a desperate move by companies seeking stardust, or if they add real value. They also suggest which boards Beyoncé , Miley Cyrus and Daft Punk might be suited to.