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Answer:

First of all, sorry for this confusion. In fact you do not have to perform internal audits for ISO 22301/BS 25999-2 if you want to be compliant with ISO 27001 only.

The "Annual Internal Audit Program" template was designed to be compliant with both ISO 27001 and ISO 223001/BS 25999-2 (these standards have the same requirements regarding internal audit), so the text on the template covers all these standards, but in the comments included in the template we show which text you can exclude in case you are using the template for only one of these standards.
This article will provide you further explanation about ISO 27001 internal audit:
- How to prepare for an ISO 27001 internal audit https://advisera.com/27001academy/blog/2016/07/11/how-to-prepare-for-an-iso-27001-internal-audit/

These materials will also help you regarding ISO 27001 internal audit:
- ISO Internal Audit: A Plain English Guide https://advisera.com/books/iso-internal-audit-plain-english-guide/
- ISO 27001:2013 INTERNAL AUDITOR COURSE https://advisera.com/training/iso-27001-internal-auditor-course/