NVQ qualifications what is it? And why people need it ? How much it cost?

NVQ - National Vocational Qualification in the UK
Why - It's a higher educational qualification
How much - Depends on the course

Further reading:
National Vocational Qualification - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/NVQ)
NVQs : Directgov - Education and learning (http://www.direct.gov.uk/en/EducationAndLearning/QualificationsExplained/DG_10039029)