Steven Falk's Review of the Scarce and Threatened Bees, Wasp and Ants of Great Britain, published in 1991, and long out of print, can now be downloaded at:
http://jncc.defra.gov.uk/pdf/Pub91_Review_of_threatened_bees_wasps_ants_PRINT.pdf
Although some of the understood statuses have changed since publication, partly through the ongoing work of BWARS, the review still contains much useful information about habitat requirements, management recommendations and detailed historic data. Although it is 22 years since its publication, this is still the current source of conservation gradings for British aculeates.
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