SolvedIEIM608040 | Notification requirement: Content and method of notification: HMRC notification document
From HM Revenue & Customs · International Exchange of Information Manual
Notification Requirement: Form and method of Notification: HMRC notification document
The wording and format of the HMRC branded document is set out in the International Tax Compliance (Customer Notification) Regulations 2016, and a copy of it can be downloaded here. The link will also provide a Welsh language version from November 2016.