Thanks Spherico, it's good to know re DVR and reassuring to receive a positive review for Send ToX.
Unfortunately Adobe Premiere Pro '*.MOV_rendered_001.mxf' files were created in my old Premiere Project, replacing many of the original media files so this has caused an issue when trying to relink the original media in FCP following the SendToX conversion. I manually changed a few of these by removing the audio in QuickTime Player as the .mxf files don't have audio, but then the relink failed due to different frame rates which was frustrating. Would you have an idea of how to replace these with the original media files in the Adobe Premiere Project please or some other kind of workaround perhaps?