VAT Returns

VAT Returns. Who has to file a return? What does self-assessment mean? What does complete and self consistent mean? When do I have to file my return?Is there a deadline for filing my return? Where do I file my return? At which banks should I pay my tax? Do I have to file an annual return under VAT? Do I need to file a return if there was no business activity in the return period? What should I do if I find I have made an error in an earlier return?