HMRC Advice on what to do if you suspect fraud with national insurance numbers

The HMRC publishes:

"a list of former Inland Revenue Manuals used by Her Majesty's Revenue & Customs (HMRC). These manuals are published in line with the Code of Practice on Access to Government Information. Further information is also available at Internal Guidance."

The National Insurance Manual is very instructive, particularly NIM39140 - National Insurance Numbers (NINOs): Format and Security: What to do if you suspect or discover fraud It reads in full:

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Thanks to Ken via the ukcrypto list for the pointer.