Here's another resource you may find useful: http://www.tombio.uk/idsignpost
It's "an online searchable catalogue of UK biological identification resources" launched today by FSC's Tomorrow's Biodiversity project. What makes it even more useful is that you can add your own entries, so if there's a particular ID guide for Sussex (or elsewhere) you'd like to add, you can. More info on how to do that here: http://www.tombio.uk/idsigninfo All the best, Charles -- Charles Roper IT Development Officer, Field Studies Council http://www.field-studies-council.org Phone: 07421 745711 | Skype: charles.roper