For some excellent proofreading guidelines, including using the BSI 5261-2 (2005) proofreading marks, take a look at the Society of Editors and Proofreaders' (SfEP) page on Accreditation in proofreading: Guidance for candidates.
This article is an overview for those proofreaders considering taking the SfEP's accreditation test. However, it's worth a read even for those who aren't. It includes some useful advice (and reminders for working proofreaders), with examples, for how to proofread to a high standard while employing good sense and adhering to your client's brief.
I was prompted to revisit this page following a fruitful discussion with a group of editing/proofreading friends about using up-to-date mark-up symbols and the differences between real-world practice and testing. My thanks to them, as always, for their advice, wisdom, knowledge-sharing and support.
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