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It seems very tall for Bugle and with bigger spaces than I would expect between the groups of flowers/leaves.
The flowers are certainly very Bugle-like but I'm not convinced.
Any ideas about other options?
You've spotted my problem!
Mint? Hempnettle? Horehound? None seem quite right.
I also spotted your problem before agreeing. However, the leaves are very much like Ajuga and not like Mentha, Salvia etc.
Lat/Lng: 51.1078, 0.0373
OS grid ref: TQ427362