Hiya, thanks for your edits around the Eden. When making alignment changes, please make sure you align your aerial imagery to the OSMUK Cadastral Parcels before starting to edit, otherwise you could be introducing a systematic error to the map. See https://wiki.openstreetmap.org/wiki/Property_extents_in_the_United_Kingdom. Basically, the aerial imagery is not guaranteed to be aligned to ground truth, either consistently across space or time. The Cadastral Parcels are the source of ground truth for alignment in the UK, so the aerial imagery needs to be aligned to them before you start to edit, otherwise you could be introducing location errors of up to about +/-3m in either direction.

Also, please do not delete and replace polygons: edit and move them instead. This preserves the edit history and hence others’ history of prior contributions to the map. It now looks like you were the first person to map these islands in the Eden near Warwick Bridge, whereas they were actually first mapped by randomgurn 13 years ago. See https://wiki.openstreetmap.org/wiki/Keep_the_history

Thanks, and happy editing :)