Polyethylene is hard to beat as far as their b-sides go. I'm very fond of The Butcher as well, and The Daily Mail / Staircase*. As for this release, even though I've heard everything before I can't but treat the supplementary tracks as a kind of long-lost album. Flows pretty well for me. My only gripe is that for £100 I'd expect the CD to be chucked in with the boxset. Not to worry though, ordered both anyway.
*Delete according to what you want to call the A-side.