DMBM510950 - Customer contact and data security: telephone contact: calls from third parties
Some content of this manual is being considered for archiving. If there is content you use regularly, please email hmrcmanualsteam@hmrc.gov.uk to let us know as soon as possible.
There are different types of third parties and depending on the type will depend on the method you use to deal with the call.
For full guidance on this, see DMBM511600.