Missing UTR code

We're trying to get a copy of a UTR code for a limited partnership which we believe has been sent to an old address. The new office address is up to date on Companies House. How do we request for another copy of the number to be sent to the new address?

Hi ,
 

You can contact HMRC on 0300 200 3310 . Thank you .

We have called several times and no-one seems to be able to help. We were told that they are unable to search for a company using the company name or company number, that they need the UTR code to bring up the details, which obviously we don't have. We simply want a copy of the UTR sent to the registered office address (as per Companies House). How do we submit this request?

Hi L Miller,
You can request your Corporation Tax UTR Online.
HMRC will send it to the business address that's registered at Companies House.
Please complete your request by following the link at:
Ask for a copy of your Corporation Tax UTR
Thank you. 

I believe that option relates to Limited Companies. We are a Limited Partnership, not a Limited Company. How does a Limited Partnership request a copy of their UTR code for Self Assessment purposes?

Hi L Miller,
If it is a limited partnership, you will need to contact HMRC on the Self Assesment helpline number 0300 200 3310 or make your request in writing to
Self Assessment,
HM Revenue & Customs,
BX9 1AS. 
Thank you.