Well I have cheated with it, Rudi.
When I get moths coming to a window light, I pot them up and store in the fridge overnight; then place them on a suitable bit of background material for a photo and then an identification.
If I get the background correct they are reluctant to leave even when I take them outside for release.
This one is more obvious to see, but I'm uncertain about the identification until I get a second opinion. Possibly a Large Wainscot?
The second opinion agrees with Large Wainscot. There are several similar species in the Wainscot family.