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I agree that this is a Robin's Pin-cushion gall, but it would be good to have the scientific name as well - would you mind adding another identification, with "Diplolepis rosae" as the scientific name? Then we should be able to get the links working with other parts of the site - thanks.
Or if you start typing in "Robin's ..." in the English name, you should be able to pick the name off the drop-down list, and then click on "Get recommended" to fill in the scientific name automatically.
Entomologist and biological recorder
Lat/Lng: 52.498, -2.043
OS grid ref: SO971888