Having just read Barry's post re Dotted Chestnut, I had a look on Aderyn to see if my 2013 garden record was there and was surprised to find it wasn't! The only record for ST08 is a 'historic' 1857 record in Llantrisant.
I was new to trapping moths and used to post images on a website called 'Back Garden Moths' for help with identification. The site is no more but I have 2 garden records for Dotted Chestnut, 09 & 12 April 2013 (images below). I only grabbed images of the first one, and as it was so distinctive I obviously didn't make the effort for the second.
Later that year I started submitting records to Dave at SEWBReC, sending spreadsheets of all my records to date but this one doesn't seem to have made it through to Aderyn which is a shame as it would add a modern record to the mix.