Article 3 Requirements
(1)
An entry clearance shall not have effect as leave to enter unless it complies with the requirements of this article.
(2)
The entry clearance must specify the purpose for which the holder wishes to enter the United Kingdom.
(3)
The entry clearance must be endorsed with:
(a)
the conditions to which it is subject; or
(b)
a statement that it is to have effect as indefinite leave to enter the United Kingdom.