Just a thought here guys. What it actually says on the packs is that the sets were recorded at Progress Promotions events, that does not necessarily mean they were recorded at Progress in Derby. The reason I'm chipping in with this is that yesterday I was trying to contribute something to the site by removing from a wall several flyers that have been there for 25+ years and scanning them up for OSA. I noticed that on one of the Ripe flyers that Up Yer Ronson had done a gig at Ripe in Mansfield. Now, that could be interpreted by the unwary on a mixtape as that the set had been recorded at Up Yer Ronson in Leeds and that would be wrong. What I'm saying is, the sets on your tapes which are listed as being at Ripe could very well be a gig by Progress visiting at Ripe in Mansfield, not a gig at Progress in Derby, as it seems from my flyer that by this period they were hosting nights by other name clubs.
Another thing, if you put in NG18 1LT which is on your packs into a postcode finder its in.............. Mansfield.