Listening to Bob Fox's version (Bob may have tweaked it slightly):

Bob says "sipping" - this makes more sense, you strip the coal, not it's dust.
It's definitely Orgreave.
Bob sings "body corridor"
Bob sings "hilly fields" - makes more sense as they are hilly (I can see them from where I work) and Ulley is too far away.
Bob also sings another two verses. I tried to get in to see Ray at a gig in June 2017 but it's sold out and I'm on teh waiting list. If I get in I'll ask him.