(1) A TPIM notice -

(a) comes into force when the notice is served on the individual or, if later, at the time specified for this purpose in the notice; and

(b) is in force for the period of one year.

(2) The Secretary of State may by notice extend a TPIM notice for a period of one year beginning when the TPIM notice would otherwise expire.

(3) A TPIM notice -

(a) may be extended under subsection (2) only if conditions A, C and D are met; and

(b) may be so extended on up to four occasions.

(4) This section is subject, in particular, to sections 13 (revocation and revival of TPIM notices) and 14 (replacement of TPIM notice that is quashed etc).