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Don't use "Add a revision" to repeat an identification that has already been made.
how should I do it then if I agree with others' IDs?
Just press on 'I agree'. Simple as that!
Don't worry about it, though; it's an etiquette thing, and we all forget etiquette sometimes! I know I do... ;)
My Flickr photos...
Lat/Lng: 54.4, -2.6
OS grid ref: NY6707