For those, like me, who did not know about these cards, here is an explanation. I gather they are available via Ancestry.
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The Andrews Newspaper Index Cards, which is part of the Andrews Collection at the Institute of Heraldic and Genealogical Studies, Canterbury, Kent have now been made available on the Ancestry.com website.
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About the Index [from another site]
This unique card index was compiled in England from the 1790s until about 1970 and features a collection of notices from newspapers and various official sources, such as the London Gazette. Approximately 250,000 cards include announcements of births, marriages, obituaries, and deaths abroad; notices of wills, unclaimed estates, and filings under the Colonial Probates Act of 1892 (which recognized probates from courts in British possessions); and advertisements for missing persons and people seeking next of kin. The original newspaper clippings on the cards sometimes include annotations referring to additional information from other sources.
Andrews Newspaper Index Cards
Andrews Newspaper Index Cards
M. no. 31