Something that needs to be kept in mind, when trying to suss out who played what, where first, is the following.
Back then The Cats/Torch/Mecca were all happening on the same night and people traveled between them. Therefore a new discovery could get played at the Cats or Mecca and then at the Torch within hours. Later on we had Sam's (Fri.)/Mecca/Wigan(Sat) and Va Va's(Fri)/Mecca/Wigan (Sat.), so a new sound could be played at 3 different places in 36 hours.
Please remember, in those days most DJ's were quite willing to lend their new sounds to other DJ's at another club, many collectors who didn't DJ, would also often lend records to DJ's too.