Had a few PM's so here's a bit more info for you-
As said in the blurb, there's one or two doubles (i.e. 2 copies) and the odd multiple (i.e. 10 copies) BUT not many.
As a ballpark guess on %
LP wise - Plenty of good quality 70's/80's Soul LP's - probably 70% with say 15% 60's and 15% 90's (sale value is between £2-£10 with probably quite a few more than a tenner)
12" wise - 70's/80's 70%, 90's/Y2k 30% (sale value is between 50p-£8 with probably quite a few more than £8)
Ideally suited to the ebayer/gemmer online entrepreneur
Cheers
Steve