I use the website - ukmoths.org.uk to check ID's (I also use books as well)
I have a spreadsheet of data from my recording sessions, and each year they are sent to the local moth recorder, who checks/questions and ultimately validates my records. These then go to a central database, so that research can be done into the changing population trends
eg: when a publication claims "X species has declined by 40% in the last 20 years", that is using recorder data