Plenty around whenever the sun shines...best time of year to see them
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Remarkable, I used to see loads of adders when I lived in kent and remember they were easiest to see early in the year but don't remember them being out quite this early.
If you have a mild spell, the males especially can emerge even earlier: though they will return underground if it turns colder again.
Lat/Lng: 53.92239259254, -0.84580510854721
OS grid ref: SE758479
Forestry Commission plantation being returned to wooded heathland