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It's a bit late in the season for DMC as it has only the one brood whereas CMC is in the middle of its 2nd brood. To be absolutely sure though, you need to look at the markings on the underside. You can find details on UK Moths website.
Thanks next time I catch one I'll try and remember to get a look at the underside. Still loads to learn about which bits of each moth I need to look at! Many thanks.
Lat/Lng: 52.1277, -2.3261
OS grid ref: SO777477