We have an active Facebook group that you can join.
Colin Plant produces an email update roughly monthly.
To receive this contact Colin (details below) with your name, address and e-mail.
Colin W. Plant
14 West Road
Tel/fax: 01279 507697
93 Bengeo Street
The Moths of Hertfordshire by Colin W. Plant published by Hertfordshire Natural History Society
Published 2008 - The definitive guide to Hertfordshire's moths
There are also updates:
Colin W. Plant "Recent changes in the moth fauna of Hertfordshire" The Hertfordshire Naturalist vol.48 part 1, 2016 25-41.
Colin W. Plant "Yet more moths new to Hertfordshire" Entomologist's Record vol.129 part 4, 2017 206-210
Published 1993 - A guide to macro moths in the LNHS area (approx a 20 mile circumference measured from central London) but now out of print
For micro moths there are:
Colin W. Plant "A provisional list of the microlepidoptera of Middlesex (vice-county 21)" London Naturalist vol.81, 2002 123-186.
Colin W. Plant "Additions and corrections to the provisional list of the microlepidoptera of Middlesex (vice-county 21)" London Naturalist vol.83, 2004 107-109
Colin W. Plant & Rachel Terry "Third update to the list of microlepidoptera of Middlesex (vice-country 21)" London Naturalist vol.90, 2004 197-185