Footage that was cut from the standard 15-20 minute web release for pacing.
Often "repacked" into 1080p or 4K with better color grading and audio syncing. diana is a naughty doctor episode 14 extended repack
When searching, ensure the file size matches an "Extended" cut. A standard episode might be 300MB, whereas an Extended Repack is usually 1GB or more due to the higher bitrate. Footage that was cut from the standard 15-20