English may be the international language of the 21st century but how should it be spoken and written? A million dollar industry has developed to stop the English language being 'used and abused'.

A book about the correct use of English grammar may seem like a surprise bestseller. But Lynne Truss's 'Eats, Shoots and Leaves' has already sold 3 million copies. Truss believes she's struck a chord with people who feel 'horror' at seeing English misused. But Professor David Crystal sees things differently.

David Crystal also airs his critical views on "zero tolerance" approach to language in this item published on YouTube.