Single plant in crowded damp flower-bed - might be hybrid, but looks like Wild Marjoram
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Definitely not Marjoram, but, so far, I have no idea what else it might be. Perhaps a garden foreigner.
Oh dear, obviously need more practice with matching observations to the key. It was a "convenient" plant to experiment on; could go back several times to check on what I thought I had seen. However, the experiment didn't work this time.
Thanks for feedback.
Lat/Lng: 51.529, -3.5026
OS grid ref: SS958821