Synopsis
Just as it seems that Willoughby and Marianne must be about to announce their engagement, he departs for London, leaving her beWildered and desolate.
Other Archive resources

Pride and Prejudice (1980) | Clip 1
starting with a sweeping view of Pemberley gardens and ending with the 4 characters walking away down a path by the lake

Pride and Prejudice (2005) | Clip 2
starting with Elizabeth walking to a window to look out over the Pemberley lake/estate to Elizabeth's line at the Lambton Inn, 'His sister?'