This page gives information about how species rich each 10Km square within the two vice counties is as well as which moths have been seen in which square historically. 
To work out which square goes with which vice-county go to the Recording Area page of this website.  

Number of Species Recorded per 10Km square
Click on the '10Km Square Map' file links here:    View   Download
 for a geographically tabular summary of the number of moth species recorded per 10km square from 1960 to the end of 2015.

Moth Matrix
The Lancashire 10km square Matrix (produced and updated by Kevin McCabe) covers every moth species recorded in Lancashire.  The Matrix has now been updated to contain all known records up to and including 31st December 2015.  The matrix has been divided into two sections (those species recorded before 1960 and not subsequently are located towards the end of the table).  This section can be used more easily to target searches for these moths. Click on '10k Matrix 2015' link here    View   Download.