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While young seedlings are sometimes dissimilar to more mature plants (but I have seen pretty small young mulleins) I don't think that this is (two) Verbascum thapsus.
I'd guess that it's something coming through after having been mown - perhaps a comfrey.
Having looked up comfrey I think you could be right and I suspect I'll just be keeping it as 'unknown' as I suspect the verge has been mowed again!
Lat/Lng: 51.39, -0.191
OS grid ref: TQ259672
Road side verge