Yeah, I've always loved the song, but the new mix is a huge improvement, sonically. There was absolutely zero publicity or mention of this being a different version when the 'Complete' boxset was released in 2011, so it was a real shock when I first heard it - the differences really leap out when you listen on headphones. I doub this was an alternate mix that was laying around at the time, as it just sounds so much better than the issued version. As Johnny handled all the remastering, I'm sure he was so annoyed with the sound of the original he went back in and did a completely new remix in 2011, then sneaked it out on the set without actually telling anyone (or trying to get permission from 'he who must not be mentioned').The subtly remixed version on/in the Smiths Complete box set has those lovely swells of feedback if my ears recall correctly.
Be nice if 'Work is a Four-Letter Word' gets the same treatment at some point, though I suspect Johnny doesn'y care about that song one way or another, so probably not.