The NIP only has to be served (ie sent) within 14 days, if it never arrives but was sent via recorded or registered post (mentioned slightly further down the bill) then it has still been served.
Course, if it wasn't sent by recorded or registered post...
(2)
A notice shall be deemed for the purposes of subsection (1)(c) above to have been served on a person if it was sent by registered post or recorded delivery service addressed to him at his last known address, notwithstanding that the notice was returned as undelivered or was for any other reason not received by him. .
(3)
The requirement of subsection (1) above shall in every case be deemed to have been complied with unless and until the contrary is proved.