The poem Lisa reads in the video is "Do Not Stand at My Grave and Weep" by Mary Elizabeth Frye.
Peter Egan's character, Paul, and Penelope Wilton's character, Anne, have the same names as they did in the 1980s sitcom Ever Decreasing Circles (1984). In that series they were neighbours with an underlying sexual tension to their relationship that was never resolved. Ricky Gervais has cited that show as an influence.
The longest episode of the series.
Tambury Gazatte Headline: -THAT TAKES THE BISCUIT-