UK company register VAT advices

I saw some UK companies registered VAT, they only took one or two weeks to register successfully. I want to know how they can make it in such a short time. May you give me some adives?

Hi William,
We aim to register businesses for VAT in as short a time as possible.
However, we need to be satisfied in all cases that the business is making taxable supplies and have a right to register and so we do need to correspond with businesses for further information where required.
This can take a little time to do but is necessary to make sure that the registration process is carried out correctly.
Thank you.