How do I get my Temporary National Insurance Number?

How do I get my Temporary National Insurance Number? Not the Permanent one.

Hi Diarmuid,
To apply for a full National Insurance Number please visit Apply for a National Insurance number
If you need a ‘temporary National Insurance Number’ for employment purposes until you receive a full National Insurance Number then your employer will do this for you.  
Thank you.
 

Thank you for the response. I already have a Temporary Number. But I can not remember it? How to I retrieve it?

Hi Diarmuid Duggan,
Temporary National Insurance Numbers are just something that an employer would use on their payroll, until they are given a full National Insurance Number from their employee.
There is no register for a Temporary National Insurance Number so you may wish to speak with your employer about this.
However, your should give them your full National Insurance Number at your earliest convenience.
Thank you.