There’s a wise old adage which asserts that those who can, do, while those who can’t tend to teach.
It was never better exemplified than in the performances of Cheryl Cole and her absurd little chum Will.I.Am (memorably mocked by Miranda Hart as ‘Will.U.R) at the Queen’s Jubilee concert.
These two have set themselves up as mentors to warbling aspirants on television talent shows, yet their own weedy voices were an embarrassment compared to others who contributed to the stupendous show outside Buckingham Palace.
Their efforts were little short of humiliating, so perhaps the time has come for the teachers themselves to learn an important lesson.
If you’re not very good, keep well away from those who are.