The ninth series of Last of the Summer Wine originally aired on BBC1 between 1 January 1986 and 27 December 1987. All episodes were written by Roy Clarke, and produced and directed by Alan J. W. Bell.
The ninth series was released on DVD in region 2 as a box set on 5 May 2008.
For reasons not disclosed, the DVD box set in the UK splits series 9 into two series, renaming the second half as series 10. As a consequence, every subsequent DVD release is mis-numbered (series 10 is now series 11; series 11 is now series 12, etc).
The trio in this series consisted of:
New Year special (1986)
Christmas special (1986)
Regular series
Christmas special (1987)
When recordings were "repackaged" for overseas sale, UK series 9 (12 episodes) was split into "Season 9" and "Season 10" (each of 6 episodes), with all subsequent "seasons" being renumbered accordingly. As a result, (for example) "Series 27" in the UK may be referred to as "Season 28" in the USA. This miss-numbering occurs on the UK DVD releases for reasons unknown.
The box set for series nine was released by Universal Playback in May 2008, mislabelled as a box set for series 9 & 10.