In the UK there's a boxed set that calls itself season one but is actually season three. Who on earth thought that was a good idea?
In the US there's 'set one' and now 'set two' while from Australia 'season four' includes two episode commentaries from Woodward.
Last night I hopped all over the web trying to work out what I already had and what would merely be duplicated by which other release.
In the end my brain imploded and I went to bed.