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There's something about self heal that it does not look like itself at times - it took me ages to be certain!!
I know - it really was a guess, I was unsure because I was looking for the purple flower heads that I saw on all pictures of it previously. Thank you though, its reassuring to know it wasn't just me who was unsure!
Lat/Lng: 51.8774, -2.089
OS grid ref: SO939198