Two families are present in Britain and these are separated in both of the documents below. These are very tentative especially the Ceraphronidae and need a lot of work to make them complete. The Ceraphronidae key contains a number of the original descriptions of species translated by myself from Kieffer's work
This superfamily includes several thousand British species and their identification is difficult. Division into the two families Braconidae and Ichneumonidae is relatively straightforward as long as characters are observed carefully. Use the key on page 24 if the Royal Entomology Society handbook: http://www.royensoc.co.uk/sites/default/files/Vol07_Part11.pdf