You put your husband’s date of birth down (Britih style: day/month/last 2 numbers of the year, e.g., 17th August 1974 = 17/08/74). You then put TN (Meaning temporary number) at the beginning and M for Male at the end, e.g., TN170874M and that’s it.

We do it all the time for international students but often have to explain it to employers. Then tell them that you will provide a real number within 4 weeks of starting the job.

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If you satisfy all the above conditions except for being resident in GB, and you still want to apply for a number, you must be liable to pay National Insurance contributions or want to pay voluntary contributions and would benefit from doing so.

Providing you satisfy these conditions, you should contact your nearest Social Security office (This is a link to the DWP (formerly DSS) website) and ask for an appointment to be interviewed for a National Insurance number.

At the interview you will need to be able to prove your identity.

you will be making a claim for benefit, or
your partner is claiming benefit for you.
This should be done through your local Jobcentre Plus office. You can find your local office on the Jobcentre Plus website.
Applying for a National Insurance number
There is a process of checks we need to go through when you apply for an NI number. Firstly, we make sure you need an NI number. Secondly, we make sure you haven’t already got an NI number. If you need an NI number and you haven’t already got one, we will write and ask you to come to an interview.
We use this interview to check your identity and, where applicable, your right to work – to make sure you are who you say you are, that you are entitled to
What is an interview for?
At the interview, we will ask you questions about who you are and why you want an NI number. This information, and any official documents you bring with you, will help to prove your identity and, where applicable, your right to work. You may also have to fill in a form to apply for an NI number.
When we give you the date of your interview, we will tell you what information or evidence to bring with you. The information or evidence you need to bring depends on why you need the NI number. The list below might give you an idea of the relevant documents.
The interview will usually be with one other person unless, for example, you need an interpreter. Sometimes we may ask for your permission to let us keep your documents for a short time. We will give you a receipt for any documents you let us keep.

What types of evidence and information can I bring?
Here are some examples of the types of evidence and information we need. We cannot accept photocopies.

General documents:

Passport
National Identity card
Birth certificate
Marriage or civil partnership certificate.
Full driving licence
Home Office documents
2 or more passports if you are of dual- or multi-nationality
Student-loan documents
Student identity card
Letter from your college, including course details
Mortgage or rental agreement
Residence or naturalisation documents
Adoption certificate
Employment documents:

Payslips
A work permit
A letter from your employer
Your contract of employment
Details of any employment agencies you are registered with.
Evidence that you are actively looking for work
Certificate of incorporation
Memorandum of association
Articles of association
Services contract
Documents if you’re self-employed:

Invoices
Letters from your accountant
Letters from your clients
A form or letter from HMRC about your self employment, for example a bill for your Class 2 National Insurance contributions.
Stock transfer form
If you have recently arrived in Britain after living outside Europe, you must bring any travel documents you have. These are documents that give information about your travel between countries. They include things like your passport, National Identity card or NASS 35 form (issued to people seeking asylum in the UK).

You should also apply for a NI number if:

you have started or are about to start work
you are self-employed, or
you want to pay voluntary NI contributions and would benefit from paying them.