It's a UK joke really but nevertheless may be understood.
Q. What distinguishes well-known radio and TV broadcaster Sir Terry Wogan from:
Lord Stevenson (former chairman HBOS); Andy Hornby (former chief exec HBOS); Sir Fred Goodwin (former chief exec, Royal Bank of Scotland); Sir Tom McKillop (former chairman, Royal Bank of Scotland); John McFall M.P. (Chair of Treasury Select Committee); Alistair Darling (Chancellor of the Exchequer.