NIN tymczasowy zostal zniesiony juz jakis czas temu i nie uzywa sie go.
http://www.hmrc.gov.uk/manuals/nimmanual/NIM39110.htm
"TN
These are Temporary Numbers which were used by employers and DWP when they did not know an individual's NINO.
Employers are no longer permitted to use TN numbers and they will not be accepted by the Quality Standard. If they do not know an employee's NINO when they submit their end of year return, they should enter the employee's date of birth and gender in the appropriate boxes on the form, following the guidance in Employers Guides, or on the HMRC internet site. See NIM39210.
The use of TN numbers by DWP is being phased out."
Lepiej sam zloz swoje papiery do HO, przynajmniej bedziesz wiedzial co sie z nimi dzieje, ze na pewno zostaly wyslane i gdzie sa Twoje dokumenty. Bylo tu cale mnostwo historii o tym jak komus zginely dokumenty, agencja nie chciala ich oddac (bo nie miala) itp.
Carpe diem.