Last of the Summer Wine: Series 20

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Last of the Summer Wine" Season 20.
Constraints: Use ONLY provided synopsis and sources. No inventing titles, names, dates, etc. No markdown, no asterisks, no headings, no bullet points in the text. Output valid JSON only.
JSON Keys:
overview: 160-220 word factual summary of Season 20's narrative arc.
primer: Array of exactly 4 concise bullet points summarizing essential previous lore, character positions, and stakes.
Source [1]: Mentions "The trio in this series consisted of:" (text cuts off). Mentions it is the BBC's longest running comedy series. Mentions "Unencumbered by wives, jobs or any other responsibilities, three senior citi" (text cuts off).
Source [2]: Cast and crew credits link.
Source [3]: British sitcom set in Yorkshire, created/written by Roy Clarke, broadcast by BBC from 1973 to 2010. Premiered as Comedy Playhouse on 4 January 1973.
Source [4]: They spend days speculating about townsfolk and thinking up adventures. Premiered in 1973. Ran for 295 episodes until 2010. Longest running comedy Britain has produced.
Source [5]: Affectionate comedy about people in the autumn of their years. World's longest-running sitcom, over 30 series and Christmas specials.
The user asks for a summary of Season 20.
Looking at the provided text: There is no information about Season 20 specifically.
The text mentions the series ran from 1973 to 2010, had 295 episodes, and over 30 series.
The text does not describe the plot of Season 20.
If I cannot find information about Season 20 in the provided sources, I must omit it rather than guess.
However, the prompt asks for a JSON object with specific keys.
If the information is missing, I cannot fulfill the word count requirement for the overview (160-220 words) without inventing facts, which is strictly forbidden.
The primer requires 4 bullet points of lore/stakes. The sources mention:
1. Set in Yorkshire.
2. Created by Roy Clarke.
3. About three senior citizens unencumbered by wives,