#1
Dear tabbers,

I've been trying to figure out the song Clog by Denis Jones. http://www.youtube.com/watch?v=e-FA3BD7QMQ&feature=related

I've got nearly all of it down except for the slightly dissonant sounding chord which reoccurs after the pentatonic diddle. (0:52-0:55)

You can see a glimpse of his left hand later but he must be using a different tuning or something considering it doesn't seem to sound at all in standard.

So if anyone could figure out the one chord I'd appreciate it very much!
Beware of people who use quotes
#2
Just from listening,
I would say this is in Bmin, I think the chord you are talking about must be ~Bdim / Bmb5 / Bm7b5
so some arrangement of B D F (A) (B) I like the extra root because it makes it more 'Bmb5' than just Bdim.
I think the next chord is F#m. If I'm in the wrong key the Numerals still apply.