All the birds released on the IoW have GPS trackers, so this should be possible to confirm - address of Roy Dennis Foundation's project, to report a white-tailed eagle sighting in England or Wales, here https://www.roydennis.org/report-white-tailed-eagle-sighting/. Even without a photo, it might fit with known tracked movements. Eagle no.G393 was absent from the IoW for 17 months before returning, roaming around England, https://www.roydennis.org/category/sea-eagle/isle-of-wight-sea-eagles/.
