AD&D modules developed by TSR's UK division.  Many of these modules take on a Tolkien-esque flavor.  Originally, these modules were to be assigned the "F" code (for "Foreign", which understandably would have alienated customers across the pond from the United States).

UK1 Beyond the Crystal Cave by Dave Brown, Tom Kirby, and Graeme Morris
UK2 Sentinel by Graeme Morris
UK3 Gauntlet by Graeme Morris
UK4 When a Star Falls by Graeme Morris
UK5 Eye of the Serpent by Graeme Morris
UK6 All That Glitters... by Jim Bambra
UK7 Dark Clouds Gather by Jim Bambra and Phil Gallagher

While the UK-series modules were written and developed by TSR's UK division, they were actually printed in the United States and shipped (after some delay) to the United Kingdom, which caused no small amount of annoyance to the UK fanbase.  Thanks to Adam Shultz for this info.

UK1 is a reworking of the "Romeo and Juliet" story.  Discussion at the time was whether to assign it module code F1, S5, or U4, before settling on UK1.

UK2 and UK3 make up the "Adlerweg" series, and were first used as the linked tournament adventure at the GamesFair 1983 Open.  Thanks to Adam Shultz for this info.

UK4 comes with a double cover (module booklet nested inside two covers of maps).  It was first used as the tournament adventure at the GamesFair 1984 Open (where it may have been called "Starfall").  Thanks to Eric Pass and Adam Shultz for this info.

The working title for UK5 was "Learning the Hard Way".

UK6 was first used as the tournament adventure at the GamesFair 1982 Open.  Thanks to Adam Shultz for this info.

UK7 was originally intended to be for the D&D Expert Set.  A pre-production cover scan is here.  Thanks to Alban Jalabert for the scan.

Printing Information

There are no distinguishable printings between modules.  While created by the TSR UK division, identical prints were published in the United Kingdom and the United States.
 

UK2 Sentinel

UK3 Gauntlet

UK4 When a Star Falls

UK6 All That Glitters...

Typographical error on the cover of this module: states "For Character Levels 3-5", but the module booklet itself states it's for levels 5-7 (and levels 5-7 follows through with the pre-generated characters).  Thanks to Scott Cordiner for this info.
 

UK7 Dark Clouds Gather

Beyond Crystal Cave	Sentinel	Gauntlet	When a Star Falls
Eye of the Serpent	All That Glitters...	Dark Clouds Gather