Total body length 1mm. Looks white from a distance. They were all over my sage.
No interactions present.
See http://www.britishbugs.org.uk/homoptera/Cicadellidae/Eupteryx_melissae.html for more information
Having checked your link, I agree, although I'd never heard of them. They're so small - but look quite nice when magnified.
Lat/Lng: 51.964087926082, 1.3555669784546
OS grid ref: TM306348
Urban gardens within a mile of the sea.