Phil: Thank you! You should not need to regenerate anything You're still the copyright holder, and able to licence the work non-exclusively multiple times, each with different terms and conditions.
Having the licence flag correctly set on Flickr is a sufficient confirmation of your intentions (since only you are in a position where can change that setting from inside Flickr for a particular image).
Person do let us know when you've found the high-res versions.
Phil: Thank you! You should not need to regenerate anything You're still the copyright holder, and able to licence the work non-exclusively multiple times, each with different terms and conditions.
Having the licence flag correctly set on Flickr is a sufficient confirmation of your intentions (since only you are in a position where can change that setting from inside Flickr for a particular image).
Person do let us know when you've found the high-res versions.