Could be P. proxima or P.bridgmanii, both of which occor on S. fragilis
University of Edinburgh and Biodiversity Observatory (OU)
2nd edition of R and S British Plant Galls has proxima on alba and fragilis and bridgmanii on "Sallows"
fragilis? Is there a Pontania fragilis?
No, but there is a Salix fragilis.
Yes, of course, in which case my original comment is correct. (Just clarifying matters, not labouring the point).
Lat/Lng: 52.011666666667, -0.70166666666667
OS grid ref: SP892355