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Sweet cicely smells of aniseed. It's easier to recognise in fruit - 20-25mm long and 8-10 mm wide (not much use at the moment but really distinctive later on).
Sweet cicely is less likely in SE England (unless garden escape) - more likely to be Cow Parsley.
Lat/Lng: 51.2936, -0.3845
OS grid ref: TQ127561