A list of Region 2 compatible AMERICAN DC Comics DVDs can be found here:
Note: MOST Warner Home Video DVDs with a specific edition authored/created with an original DVD release date between 2002 and the end of 2011 SHOULD be coded for Regions 1, 2, 3 & 4. A few 'new' releases of the period (2006's Superman Returns) were locked to Region 1 but not too many. As of 2012 NEW editions or titles from WHV USA/Canada DVDs are no longer Region 2 compatible and require the use of a Multi-Region device/player.
I implore all UK customers to do research before buying.
Importing DVDs & Blu-rays can be a tricky thing if you don't know what to look for.
I take absolutely no responsibility for the purchasing decisions of others.
Please note: I own the original DVD releases, not subsequent reissues or repackages WHV put out in later years.
I hope my guide is of some help to you.