Keys for the identification of British Ichneumonidae
To proceed to subfamily within Ichneumonidae use Broad's online key published at www.nhm.ac.uk/resources-rx/files/ich_subfamily_key_2_11_compressed-95113.pdf.
Getting into genus and species level is difficult and the literature is very patchy.
Some families have been covered by books in the Handbooks for the Identification of British Insects series
Acaenitinae - see below
Alomyinae - see below
Anomaloninae see below
Banchinae: purchase Brock (2017) Handbooks for the Identification of British Insects, Volume 7, Part 4
Collyriinae - see below
Ichneumoninae: http://www.royensoc.co.uk/sites/default/files/Vol07_Part02a_i.pdf and http://www.royensoc.co.uk/sites/default/files/Vol07_Part02a_ii.pdf key to tribes below
Metopiinae - see below
Mesochorinae - see below
Ophioninae - see below
Orthopelmatinae: http://www.royensoc.co.uk/sites/default/files/Vol07_Part02b.pdf
Phygadeuontinae - see below
Pimplinae: http://www.royensoc.co.uk/sites/default/files/Vol07_Part01.pdf - an updated key for this subfamily is provided below
Rhyssinae - see below
Subfamily Acaenitinae key to British species.pdfSubfamily Alomyinae key to species.pdfSubfamily Anomaloninae key to British species.pdfSubfamily Collyriinae key to British species.pdfSubfamily Ichneumoninae key to British tribes.pdfSubfamily Mesochorinae key to British genera and species.pdfSubfamily Metopiinae key to British genera.pdfSubfamily Ophioninae key to UK species.pdfSubfamily Orthocentrinae, key to British genera and some species.pdfSubfamily Phygadeuontinae key to British genera.pdfSubfamily Pimplinae key to genus and some species.pdfSubfamily Rhyssinae key to species.pdf